Which problem can arise from this type of attack?

A system administrator detects thousands of open idle connections from the same source.Which problem can arise from this type of attack?

A.
It enables an attacker to perform an IP sweep of devices.

B.
It enables a hacker to know which operating system the system is running.

C.
It can overflow the session table to its limit, which can result in rejection of legitimate traffic.

D.
It creates a ping of death and can cause the entire network to be infected with a virus.