The question requires adding a new 500 GB disk as drive D:, which is currently assigned to the 7 GB temporary disk. The temporary disk also holds the page file, which is critical for performance.

1. To change the drive letter of the temporary disk, the page file must first be moved. The only viable option is drive C:.
2. Once the page file is moved (and the system rebooted, which is implied), the temporary disk's letter can be changed from D: to something else (e.g., T:).
3. With the D: letter now free, the new 500 GB disk can be added and assigned drive letter D:.
4. To "maintain the current performance," the page file must be moved back to the fast, local temporary disk (which now has a new drive letter). The action "Move the page file to Temporary Storage" refers to this disk, not the new D: drive.

Microsoft Azure Documentation (learn.microsoft.com): Temporary disk on Azure VMs

Reference: This official documentation explains the purpose of the temporary disk (often D:) on Azure Virtual Machines, which are used for AVD session hosts. It states, "The temporary disk is primarily used for the page file (pagefile.sys)."

Section: "Best practices" and "Temporary disk"

Explanation: This source confirms the disk D: shown in the exhibit is the temporary disk and its intended use is for the page file to ensure optimal performance.

Microsoft Azure Documentation (learn.microsoft.com): Change the drive letter of the Windows temporary disk

Reference: This document provides the exact procedure for this scenario.

Section: "Steps to change the temporary disk drive letter"

Explanation: The official steps are: 1. Move the page file to the OS disk (C:). 2. Reboot the VM. 3. Change the drive letter of the temporary disk (D:). 4. Attach the new data disk and assign it D:. 5. (Recommended) Move the page file back to the temporary disk. This directly maps to the four correct actions in the solution.