When planning for online dump tape use, how many tapes are required if your retaindepth is three?

A.
enough to accommodate four generations of all files you will be dumping on a regular basis

B.
enough to accommodate three generations of all files you will be dumping on a regular basis plus
an extra three tapes

C.
enough to accommodate six generations of all files you will be dumping on a regular basis

D.
enough to accommodate three generations of all files you will be dumping on a regular basis