How is oversubscription between disk arrays and hosts calculated when you use only line-rate capable line cards?

How is oversubscription between disk arrays and hosts calculated when you use only line-rate capable line cards?
A . by dividing the total bandwidth of the disk array ports by the total bandwidth of the Inter-Switch Links
B . dividing the total bandwidth of the host ports by the total bandwidth of the disk array ports
C . by dividing the total bandwidth of the host ports by the total bandwidth of the Inter-Switch Links
D . by dividing the total bandwidth of the disk array ports by the total bandwidth of the host ports

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Answer: A