Which two actions help you achieve this objective?

You must protect your network against Layer 4 scans.

Which two actions help you achieve this objective? (Choose two)

A.
Configure an IPS rule to use the predefined attack group SCAN.

B.
Configure screens capable of blocking port scans.

C.
Configure an IPS rule to use the predefined attack group SCAN and enable the DP option in a security policy

D.
Enable TCP/UDP monitoring to discover scan sources and block them.