John works as an Ethical Hacker for PassGuide Inc. He wants to find out the ports that are open in PassGuide’s server using a port scanner. However, he does not want to establish a full TCP connection. Which of the following scanning techniques will he use to accomplish this task?

John works as an Ethical Hacker for PassGuide Inc. He wants to find out the ports that are open in PassGuide’s server using a port scanner. However, he does not want to establish a full TCP connection. Which of the following scanning techniques will he use to accomplish this task?
A . TCP SYN
B . TCP SYN/ACK
C . TCP FIN
D . Xmas tree

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Answer: A