Certkiller .com is buying three DL710s and is planning to use Remote Copy. Virtual tapes from DL710 A will be copied over to DL710 B. Virtual tapes from DL710 B will be copied over to DL710 C. Virtual tapes from DL710 C will be copied over to DL710 A.
How many licenses do they need?

A.
6

B.
9

C.
1

D.
3