While analyzing the Traffic log, you see that some entries show "unknown-tcp" in the Application column What best explains these occurrences?

While analyzing the Traffic log, you see that some entries show "unknown-tcp" in the Application column What best explains these occurrences?
A . A handshake took place, but no data packets were sent prior to the timeout.
B. A handshake took place; however, there were not enough packets to identify the application.
C. A handshake did take place, but the application could not be identified.
D. A handshake did not take place, and the application could not be identified.

Answer: C