Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

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Question:
Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

Explanation: In a TCP session, when a device has no more data to send, it will send a segment with the FIN flag set. The connected device that receives the segment will respond with an ACK to acknowledge that segment. The device that sent the ACK will then send a FIN message to close the connection it has with the other device. The sending of the FIN should be followed with the receipt of an ACK from the other device.

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