【单选题】
A <{p}>The Passive firewall, which then synchronizes to the active firewall<{br/}><{/p}>
B <{p}>The active firewall, which then synchronizes to the passive firewall<{br/}><{/p}>
C <{p}>Both the active and passive firewalls, which then synchronize with each other<{br/}><{/p}>
D <{p}>Both the active and passive firewalls independently, with no synchronization afterward<{br/}><{/p}>
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