A storage appliance in a clustered configuration can’t access its partner’s mailbox disks. When you enter the cf status command, you see the following:
filer2> cf status
filer1 is up, takeover disabled because of reason (partner mailbox disks not accessible or invalid)
What should you check first to resolve this issue?

A.
Check volumes of all disks

B.
Check NIC adapter

C.
Check that initiator is set to “target” mode

D.
Check for disk viability or FC-AL problems