When assigning shelf IDs to SAS-connected shelves, which statement is true?

A.
They only need to be unique within an HA pair.

B.
They only need to be unique within a stack.

C.
They only need to be unique within a node.

D.
They need to be unique within a cluster.

Explanation:
IDs must be unique within an HA pair.
https://library.netapp.com/ecmdocs/ECMP1256807/html/GUID-FF56A1A7-
F2ED-4F3D-BC2A-366609422B4D.html