What OSPF command, when configured, will include all interfaces into area 0?

What OSPF command, when configured, will include all interfaces into area 0?
A .  network 0.0.0.0 255.255.255.255 area 0
B .  network 0.0.0.0 0.0.0.0 area 0
C .  network 255.255.255.255 0.0.0.0 area 0
D .  network all-interfaces area 0

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Answer: A