How should an administrator enable secure access to Volumes using a password?

How should an administrator enable secure access to Volumes using a password?
A . iSER
B . CHAP
C . SAML
D . LDAP

Answer: B

Explanation: https://portal.nutanix.com/page/documents/details/?targetId=Web-Console-Guide-Prism-v50:wc-block-services-enabling-t.html

Provision storage on the Nutanix cluster by creating a volume group. Create a client whitelist to enable access to the volume group by using the IP addresses or client initiator IQNs in a whitelist (as part of the volume group configuration). Create a secret for the volume group if you are using CHAP authentication.