Which statement about LACP is true?

A.
LACP is enabled by default on aggregated Ethernet interfaces.

B.
LACP is enabled by default on redundant trunk groups.

C.
The default mode of operation of an LACP interface is passive.

D.
At least one side of an LACP session must be configured as passive.

Explanation:
The LACP mode can be active or passive. If the actor and partner are both in passive mode, they do not exchange LACP packets, which results in the aggregated Ethernet links not coming up. If either the actor or partner is active, they do exchange LACP packets. By default, LACP is in passive mode on aggregated Ethernet interfaces. To initiate transmission of LACP packets and response to LACP packets, you must enable LACP active mode.