What caused the update failure?

A company has a vault relationship between ClusterA and ClusterB. After a month of operations, the SnapVault update fails. The primary and secondary volumes have been thin provisioned and are reporting available space. There is connectivity between ClusterA and ClusterB.

What caused the update failure?
A . The secondary volume’s aggregate is full.
B . There are 251 Snapshot copies on the destination SnapVault.
C . A cluster peering relationship was not refreshed every month.
D . The primary volume’s aggregate is full.

Answer: B