Implementing Cisco IP Switched Networks (SWITCH v2-0) (#158)

Which two statements about dynamic MAC address learning are true? (Choose two.)

Dynamically-learned MAC addresses can be cleared on a per-interface basis only.
It must be enabled on ports with port security enabled.
It can be disabled on a per-VLAN basis only.
Switch interfaces learn MAC addresses dynamically by default.
Dynamically-learned MAC addresses supersede static MAC addresses