Your company uses the Volume Shadow Copy Service (VSS) to perform full backups of the Exchange Server 2007 mailbox databases every night.
There is a backup window between 20:00 and 24:00 each week night and a backup window between
19:00 and 24:00 on Saturdays and Sundays.
The full backups currently take five hours to complete. Management requests that you modify the backup configuration to meet the following requirements.
At least one full backup must be performed per week.
Logs must be truncated more often than once per week. Backups must be performed within the current backup windows. Database restores must require no more than two backup files. You need to configure the backups for the mailbox databases to meet the requirements.
What should you do?

A.
Configure differential backups on week nights and full backups on Saturdays and Sundays.

B.
Configure incremental backups on week nights and full backups on Saturdays and Sundays.

C.
Configure daily full backups, and throttle the database checksum.

D.
Configure daily copy backups, and throttle the database checksum.