Which three flags are set?

An attacker scans a host with the below command.

Which three flags are set? (Choose three.) #nmap CsX host.domain.com
A . This is ACK scan. ACK flag is set
B . This is Xmas scan. SYN and ACK flags are set
C . This is Xmas scan. URG, PUSH and FIN are set
D . This is SYN scan. SYN flag is set

Answer: C