What helps avoid split brain in active-passive high availability (HA) pair deployment?

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What helps avoid split brain in active-passive high availability (HA) pair deployment?
A . Using a standard traffic interface as the HA2 backup
B . Enabling preemption on both firewall s in the HA pair
C . Using the management interface as the HA1 backup link
D . Using a standard traffic interface as the HA3 link

Answer: C