what is the optimal number of SVC Fibre Channel connections to a full 15 module XIV?

Based on best practice, what is the optimal number of SVC Fibre Channel connections to a full 15 module
XIV?

A.
connect the SVC to 6 XIV ports

B.
connect the SVC to 9 XIV ports

C.
connect the SVC to 12 XIV ports

D.
connect the SVC to 16 XIV ports