You have only a limited number of tapes available, and need to use them to hold as much data as possible.
Which tape device allows you to save the most data on a single tape?

A.
/dev/rmt/oz

B.
/dev/rmt/01

C.
/dev/rmt0m

D.
/dev/rmt/0h

Explanation:

The tape device /dev/rmt/0h is used as a high density device. that uses a compression ratio dependant on the capability of the drive.