You administer a Microsoft SQL Server database named Sales. The database is 3 terabytes in size. The Sales
database is configured as shown in the following table:

You discover that Sales_2.ndf is corrupt. You need to recover the corrupted data in the minimum amountof
time. What should you do?

A.
Perform a file restore.

B.
Perform a transaction log restore.

C.
Perform a restore from a full backup.

D.
Perform a filegroup restore.

Explanation:
According to these references, this answer looks correct.
Reference: http://technet.microsoft.com/en-us/library/ms187048.aspx
Reference: http://msdn.microsoft.com/en-us/library/aa337540.aspx
Under the simple recovery model, the file must belong to a read-only filegroup.
Under the full or bulk-logged recovery model, before you can restore files, you must back up the active
transaction log (known as the tail of the log). Formore information, see Back Up a Transaction Log (SQL
Server).
To restore a database that is encrypted, you must have access to the certificate or asymmetric key that was
used to encrypt the database. Without the certificate or asymmetric key, the database cannot be restored. As a
result, the certificate that is used to encrypt thedatabase encryption key must be retained as long as the
backup is needed. For more information, see SQL Server Certificates and Asymmetric Keys.