Why would an attacker saturate the network with noise while simultaneously launching an attack?

Why would an attacker saturate the network with noise while simultaneously launching an attack?

A.
An attack may go undetected

B.
It will have no effect on the ability of the sensor to detect attacks.

C.
It will initiate asymmetric attack techniques.
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Cisco 642-533: Practice Exam

D.
It causes the Cisco IDS to fire multiple false negative alarms.