what this configuration allows?

A network engineer configures port security and 802.1x on the same interface. Which option describes what this configuration allows?

A.
It allows port security to secure the MAC address that 802.1x authenticates.

B.
It allows port security to secure the IP address that 802.1x authenticates.

C.
It allows 802.1x to secure the MAC address that port security authenticates.

D.
It allows 802.1x to secure the IP address that port security authenticates.

Explanation:
802.1X and Port Security

You can configure port security and 802.1X on the same interfaces. Port security secures the MAC addresses that 802.1X authenticates. 802.1X processes packets
before port security processes them, so when you enable both on an interface, 802.1X is already preventing inbound traffic on the interface from unknown MAC
addresses.
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_1/nx- os/security/configuration/guide/sec_nx-os-cfg/sec_portsec.html