As shown in the figure, VRRP is associated with a BFD session.

[: HCIP-Datacom-Core Technology Training Material (VRRP and BFD Association)​.,  Master_Down_Timer Behavior:, Normally, when a VRRP backup device detects that the master is down (through missed VRRP advertisements), the Master_Down_Timer dictates the failover timing., However, when VRRP is associated with BFD:, BFD detects faults immediately (sub-second detection)., The backup device does not wait for the Master_Down_Timer to expire. Instead, it immediately assumes the master role upon fault detection by BFD., Reference: HCIP-Datacom-Core Technology Training Material (VRRP Failover Mechanism)​​.,  Why the Statement is FALSE:, The statement claims that the backup device assumes the master role after the Master_Down_Timer expires when a fault is detected by BFD., This is incorrect because BFD bypasses the need for the Master_Down_Timer to expire. The backup device transitions to the master role immediately upon BFD detecting a fault.,  Conclusion:, The correct behavior of VRRP when associated with BFD is immediate role assumption by the backup device upon fault detection, bypassing the Master_Down_Timer., Therefore, the statement is FALSE., ]