An administrator is attempting to add two FAS8020 nodes to an existing cluster of eight
FAS2552 nodes. They are receiving an error when attempting to join the new nodes.
What is causing this error?

A.
The cluster switch connections have been cabled incorrectly.

B.
The disk shelves on one of the new nodes are displaying an error.

C.
The maximum number of nodes is already in the cluster.

D.
The new nodes are running a newer version of clustered Data ONTAP.