What communication link is necessary in order to establish an inter-cluster relationship?

A.
The cluster interface on each node must be able to communicate with the intercluster
interface on each node in the both the source and destination clusters

B.
The cluster interface on the source cluster must be able to communicate with the cluster
interface on the destination cluster

C.
The intercluster interface on the source cluster must be able to communicate with the
intercluster interface on the destination cluster

D.
The intercluster interface on the source cluster must be able to communicate with the
cluster interface on the destination cluster

Explanation:
https://library.netapp.com/ecm/ecm_download_file/ECMP1197114