An administrator has created three BasicDisk storage units within the NetBackup Administration Console (STU-A, STU-B, and STU-C). The administrator needs to create a backup policy that evenly rotates use of each of these storage units during backup. How can the policies or storage units be set up to accomplish this?
A. set up each of the policies to use "Any Available" storage unit
B. set up a storage unit group for these STUs and select "Failover" option for storage unit selection
C. set up a storage unit group for these STUs and select "Least recently selected storage unit" option
D. set up a storage unit group for these STUs and select "Choose storage units based on order specified above" option