What techniques would you use to evade IDS during a Port Scan?

What techniques would you use to evade IDS during a Port Scan? (Select 4 answers)

A.
Use fragmented IP packets

B.
Spoof your IP address when launching attacks and sniff responses from the server

C.
Overload the IDS with Junk traffic to mask your scan

D.
Use source routing (if possible)

E.
Connect to proxy servers or compromised Trojaned machines to launch attacks