Why is the AE interface showing down on the passive firewall?

The Aggregate Ethernet interface is showing down on a passive PA-7050 firewall of an active/passive HA pair. The HA Passive Link State is set to "Auto" under Device > High Availability > General > Active/Passive Settings. The AE interface is configured with LACP enabled and is up only on the active firewall.

Why is the AE interface showing down on the passive firewall?
A . It does not perform pre-negotiation LACP unless "Enable in HA Passive State" is selected under the High Availability Options on the LACP tab of the AE Interface.
B. It does not participate in LACP negotiation unless Fast Failover is selected under the Enable LACP selection on the LACP tab of the AE Interface.
C. It participates in LACP negotiation when Fast is selected for Transmission Rate under the Enable LACP selection on the LACP tab of the AE Interface.
D. It performs pre-negotiation of LACP when the mode Passive is selected under the Enable LACP selection on the LACP tab of the AE Interface.

View Answer

Answer: A