If a host receives a TCP packet with an SEQ number of 1234, an ACK number of 5678, and a length of 1000 bytes, what will it send in reply?
A. a TCP packet with SEQ number: 6678, and ACK number: 1234
B. a TCP packet with SEQ number: 2234, and ACK number: 5678
C. a TCP packet with SEQ number: 1234, and ACK number: 2234
D. a TCP packet with SEQ number: 5678, and ACK number 2234
