Which type of scan does not open a full TCP connection?

Which type of scan does not open a full TCP connection?

A.
Stealth Scan

B.
XMAS Scan

C.
Null Scan

D.
FIN Scan

Explanation:
Stealth Scan: Instead of completing the full TCP three-way-handshake a full connection is not made. A SYN packet is sent to the system and if a SYN/ACK packet is received it is assumed that the port on the system is active. In that case a RST/ACK will be sent which will determined the listening state the system is in. If a RST/ACK packet is received, it is assumed that the port on the system is not active.