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