Which statement about the Port Aggregation Protocol is true?

A.
Configuration changes made on the port-channel interface apply to all physical ports
assigned to the port-channel interface.

B.
Configuration changes made on a physical port that is a member of a port-channel
interface apply to the port-channel interface.

C.
Configuration changes are not permitted with Port Aggregation Protocol. Instead, the
standardized Link Aggregation Control Protocol should be used if configuration changes are
required.

D.
The physical port must first be disassociated from the port-channel interface before any
configuration changes can be made.

Explanation:
The port-channel interface is a logical interface that encompasses the all physical port
members of the EtherChannel. So configuration changes made on the port-channel interface
apply to all physical ports assigned to the port-channel interface.
Reference:
http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a00
80094647.shtml