You need to ensure that the tape drive is available from the DPM Administrator console

Your company has a private cloud that is managed by using a System Center 2012 infrastructure.

An administrator installs a new tape drive on a server that has Data Protection Manager (DPM) installed.

You discover that the tape drive is unavailable from the DPM Administrator console.

You verify that the tape drive is installed correctly on the DPM server.

You need to ensure that the tape drive is available from the DPM Administrator console.

What should you do from the DPM Administrator console?

A.
From the Agents view, click Install.

B.
From the Disks tab, click Add.

C.
From the Protection view, click Tape.

D.
From the Libraries view, click Rescan.

Explanation:
To configure tape libraries

In DPM Administrator Console, on the navigation bar click Management, and then click the Libraries tab.

In the Actions pane, click Rescan.

The Rescan operation might take several minutes to complete. DPM will add any library jobs to the queue that began during the Rescan operation. If a library job is already in progress when the Rescan operation begins, the Rescan operation will fail.

Configuring Tape Libraries
http://technet.microsoft.com/en-us/library/ff399665.aspx