Reset To A Stranger

A client sends a SYN to port 9000 with sequence number 1000 and no ACK bit set. No process is listening on that port, so the connection is in CLOSED state and the host answers with a reset.

What does that RST carry?

A

SEQ 1001, ACK 1001, with the ACK bit set

B

SEQ 0, ACK 1001, with the ACK bit set

C

SEQ 0, ACK 1000, with the ACK bit set

D

SEQ 1000, ACK 0, with the ACK bit clear