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Two testing types that an architect should recommend to ensure users don’t face platform slowdowns during peak business hours are: stress testing and performance testing. Stress testing is the process of testing the system under extreme load conditions, such as a large number of concurrent requests, to determine its breaking point and identify any potential bottlenecks or failures. Performance testing is the process of testing the system under normal or expected load conditions, such as the average number of requests per day, to measure its response time, throughput, and resource utilization. These testing types can help ensure that the web service can handle the expected volume and frequency of requests, and that it meets the performance and reliability requirements. Unit testing is not a testing type that an architect should recommend for this scenario, as it is the process of testing individual units of code, such as methods or classes, to verify their functionality and logic. Load testing is also not a testing type that an architect should recommend for this scenario, as it is the process of testing the system under a specific load condition, such as a fixed number of requests, to evaluate its behavior and performance. See Testing RESTful Web Services for more details.

 D is the correct answer, as the risk with this plan is that multiple work-streams with dependencies could impact the go-live. If the legacy system upgrade and the new integration are not aligned and coordinated, there could be delays, errors, or failures in the project delivery. A is incorrect, as the deadline being scheduled during a Salesforce release is not a risk, but an opportunity to leverage the new features and enhancements that Salesforce provides. B is incorrect, as the project team using the Waterfall methodology is not a risk, but a choice that depends on the project scope, complexity, and requirements. C is incorrect, as the legacy system team using an Agile methodology is not a risk, but a choice that depends on the project scope, complexity, and requirements. You can learn more about the risk management in the Project Management Strategies for Salesforce Implementations module on Trailhead.

Creating design standards focused on integration and providing training to all teams is the best way to address the challenges of having various integration patterns and a lack of common understanding of the integration landscape. Design standards can help to establish consistent and best practices for integrating Salesforce with other systems, such as choosing the appropriate integration style, pattern, tool, and protocol. Training can help to educate and align the teams on the design standards and the integration architecture.

This is the correct answer because some components, such as custom settings, user permissions, and email templates, cannot be deployed via the Metadata API. Therefore, these components should be documented and manually deployed or configured in the target environment.