When upgrading an existing IBM TS4500 Tape Library, which solution provides high availability (HA) functionality?

When upgrading an existing IBM TS4500 Tape Library, which solution provides high availability (HA) functionality?
A . One new storage frame or drive frame with second accessor
B . MES upgrade to add a second accessor to one of the existing frames
C . An HA frame that automatically ships two service bays and accessor
D . A HA frame and a drive fame plus a second accessor

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Answer: B