Which statement is TRUE of anti-spoofing?

Which statement is TRUE of anti-spoofing?
A . Anti-spoofing is not needed when IPS software blade is enabled
B. It is more secure to create anti-spoofing groups manually
C. It is BEST Practice to have anti-spoofing groups in sync with the routing table
D. With dynamic routing enabled, anti-spoofing groups are updated automatically whenever there is a routing change

Answer: C