Chap Security Level for Independent hardware ISCSI?

Chap Security Level for Independent hardware ISCSI? (Choose Two)

A.
Do not use Chap

B.
Do not use CHAP unless required by target

C.
Use Chap unless prohibited by target

D.
Use chap

Explanation:
NEW Question – Please review answers and post opinions on the answers.. may answers need to be in this format:

http://pubs.vmware.com/vsphere-50/topic/com.vmware.vsphere.storage.doc_50/GUID-3F97FB05-3C92-4040-84E7-D928555B3808.html