What must be done to relinquish the role to the standby Cisco ACE Module?

Below is the configuration of an active Cisco ACE Module :

active Cisco Ace Module has priority level of 150
standby Cisco Ace Module has a priority level of 120 probes are configured with host tracking

Two probes fail. What must be done to relinquish the role to the standby Cisco ACE Module?

A.
configure the probe with a priority level of 10

B.
take no action; the Cisco ACE Module automatically relinquishes the role of active on failure of a probe
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C.
configure the probe with a priority level of 20

D.
configure the probe with a priority level of 40