Which of the following descriptions of IPS top definition signatures is incorrect?

Which of the following descriptions of IPS top definition signatures is incorrect?
A . The content of predefined signatures is not fixed and can be created, modified or deleted.
B . When the action of the predefined signature is blocking, block the packets that hit the signature and record the log.
C . When the action of the predefined signature is release, the packets that hit the signature will be released and no log will be recorded.
D . When the action of the predefined signature is alarm, the packets that hit the signature will be released, but the log will be recorded.

Answer: A