Given:
If a level 0 backup of /export/home were attempted, it would consume approximately
3.8 GBytes of tape space. What can you use to determine how much tape space would be
consumed if a level 3 incremental backup were attempted?

A.
du ks /export/home

B.
ufsdump 3S /export/home

C.
ufsdump 3L /export/home

D.
find /export/home size level 3 print

Explanation:

The option to use is the S option. This is the size estimate flag that estimates The size of the dump (level 3 in this case) without actually performing the dump.