You need to retain only the last System Protection snapshot of the computer

You have a computer that runs Windows 7. The computer has System Protection enabled.
You need to retain only the last System Protection snapshot of the computer. All other snapshots
must be deleted.
What should you do?

A.
Run Disk Cleanup for Programs and features.

B.
Run Disk Cleanup for System Restore and Shadow Copies.

C.
From the System Protection Restore settings, select Turn off System Restore.

D.
From the System Protection Restore settings, select Only restore previous versions of files.

Explanation:

Shadow info:
Shadow copies are automatically saved as part of a restore point. If system protection is enabled,
Windows 7 automatically creates shadow copies of files that have been modified since the last

restore point was created. By default, new restore points are created every seven days or whenever
a significant system change (such as a driver or application installation) occurs.