Which statement is true about expanding an aggregate from 32-bit to 64-bit in place?

Which statement is true about expanding an aggregate from 32-bit to 64-bit in place?
A . All aggregates are automatically converted from 32-bit to 64-bit with the Data ONTAP 8.1 upgrade.
B.The expansion is triggered by an aggr convert command.
C.The expansion is triggered by adding disks to exceed 16 TB.
D.The 32-bit aggregates are degraded and must be Volume SnapMirrored to a new 64-bit aggregates with Data ONTAP 8.1 upgrade.

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Answer: B