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To count child records (Trails) on a parent record (Park) without code, a Roll-up Summary field is required. However, Roll-up Summary fields only work when a Master-Detail relationship exists.

Why A (Roll-up Summary) is correct:Exact Extract:“A roll-up summary field calculates values from related records, such as those in a related list, on a master record. You can count the number of related records or summarize fields.” — Salesforce Help | Roll-Up Summary Fields

Why D (Master-Detail Relationship) is correct:Exact Extract:“Roll-up summary fields are available only for master-detail relationships.” — Salesforce Help | Relationships OverviewTherefore, the Trail object must be the detail and the Park object the master to enable the roll-up count.

Why D (Master-Detail Relationship) is correct:Exact Extract:“Roll-up summary fields are available only for master-detail relationships.” — Salesforce Help | Relationships OverviewTherefore, the Trail object must be the detail and the Park object the master to enable the roll-up count.

Why not B:Formula fields can’t count related records.

Why not C:Lookup relationships don’t support roll-up summaries natively.

 The two considerations that an app builder should keep in mind during the deployment process using change sets are: Change sets do not include all components and may have to perform some changes manually. Change sets are a way to deploy metadata changes from one Salesforce org to another, but they do not support all types of components, such as reports, dashboards, email templates, etc. The app builder may have to use other methods, such as unmanaged packages or manual configuration, to deploy these components. Users should be logged out of production when receiving inbound change sets. This is a best practice to avoid any errors or conflicts that may occur when deploying changes to production. Users may be working on records or components that are being updated by the change set, which may cause data loss or inconsistency. Salesforce Connect does not automatically establish a link between environments. Salesforce Connect is a feature that allows users to access data from external sources without storing it in Salesforce. It does not have anything to do with deploying changes between Salesforce orgs. Transactions will not revert if the deployment errors. Transactions are units of work that are either completed entirely or not at all. If a deployment error occurs during a transaction, the transaction will be rolled back and no changes will be made to the target org. However, this does not mean that the source org will revert to its previous state before the deployment.

The app builder should know that a field type change is included in the change set and that it can cause a delay in the deployment. A field type change is a change that modifies the data type of an existing field, such as changing a text field to a number field. A field type change can affect many aspects of Salesforce functionality, such as validation rules, formulas, workflows, reports, dashboards, and more. Therefore, deploying a change set that contains a field type change can take longer than usual and require more testing and verification. Option A, C, and D are not changes that can cause a delay in the deployment.

The app builder should add the field to the custom report type field layout to troubleshoot this issue. A custom report type is a type of report that defines which objects and fields are available for reporting. The app builder can customize which fields are included in each custom report type by editing its field layout. If a new field is added to an object that is part of an unmanaged package, it will not be automatically added to the custom report type field layout. The app builder needs to manually add it to make it available as an option to add as a column in reports based on that custom report type. Option A, B, and D are not steps that can troubleshoot this issue.