What is a unique characteristic of the most secure mode?

Cisco 802.1X phasing enables flexible deployments through the use of open, low-impact, and
closed modes. What is a unique characteristic of the most secure mode?

A.
Granular ACLs applied prior to authentication

B.
Per user dACLs applied after successful authentication

C.
Only EAPoL traffic allowed prior to authentication

D.
Adjustable 802.1X timers to enable successful authentication