Which two actions satisfy this requirement and require the least amount of administrative effort?

Acme Disposal Services is a large company which has many administrators. For auditing purpose, each administrator must use a unique account to access ESXi hosts.

Which two actions satisfy this requirement and require the least amount of administrative effort? (Choose two)

A.
Configure Authentication Services for Active Directory based authentication to ESXi

B.
Configure a unique root level account for each administrator using vSphere Client.

C.
Configure user accounts in a host profile, then apply the host profile to ESXi hosts

D.
Configure Active Directory based authentication on the ESXi host using esxcli-auth

Explanation:
Reference: http://searchvmware.techtarget.com/tip/Whats-new-in-ESXi-41-Active-Directory- integration-Tech-Support-Mode-and-more