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Disabling guest accounts on domain-joined machines is done through Group Policy. Group Policy allows centralized management and configuration of operating systems, applications, and users' settings in an Active Directory environment. By using the Group Policy Editor (gpedit.msc), administrators can enforce policies such as disabling the guest account across all machines within the domain. The other options (Firewall, Microsoft Management Console, MSConfig) do not provide functionality specific to managing user accounts in this context.

Phishing involves tricking individuals into disclosing sensitive information or installing malware through deceptive emails.

Whaling: A specific type of phishing targeting high-profile individuals.

Insider threat: Malicious activities by someone within the organization.

Phishing: General deceptive emails to trick users into compromising information or installing malware.

Vishing: Voice phishing, conducted over the phone.

Evil twin: A rogue Wi-Fi access point mimicking a legitimate one to intercept data.

Detailed Explanation with Core 2 References:If multiple unsuccessful attempts led to the account being locked, the technician should unlock the account. Core 2 covers user account management practices, including unlocking accounts and managing failed login attempts (Core 2 Objective 2.5)​.

Restarting a smartphone is a basic troubleshooting step that often resolves temporary software glitches or minor errors that might be preventing the screen rotation from working correctly. It's a quick and easy step to try before moving on to more complex solutions.

Here's why the other options are not the best first step:

A. Remove the screen protector: While a thick or improperly installed screen protector could potentially interfere with the sensors responsible for screen rotation, it's less likely to be the cause.

B. Update the smartphone’s software: While software updates can fix bugs and improve functionality, they are not always necessary for resolving a screen rotation issue.

D. Replace the smartphone: Replacing the smartphone is a drastic measure and should only be considered if other troubleshooting steps fail.

Troubleshooting Steps:

Restart the smartphone: This often clears temporary software issues.

Check for software updates: If a restart doesn't work, updating the operating system or any relevant apps might resolve the issue.

Calibrate the accelerometer: Some smartphones have a calibration tool for the accelerometer, the sensor that detects orientation. Check the device settings for this option.

Check for hardware issues: If the problem persists, there might be a hardware issue with the accelerometer or other components. In this case, contacting the manufacturer or a repair center might be necessary.