Which of the following description about verifying whether a received Hello message is legal is wrong?

Which of the following description about verifying whether a received Hello message is legal is wrong?
A .  If the network type of the receiving port is point-to-point or virtual link, the Network Mask field is not checked
B .  The RouterDeadIntera1 field in the received Hello message must be consistent with the configuration of the receiving port
C .  If the network type of the receiving port is broadcast, point-to-multipoint or NBMA, the Network Mask field in the received Hello message may be inconsistent with that of the interface
D .  The E-bit in the Options field in the received Hello message must be consistent with the configuration of the relevant area

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Answer: C