In a TCP connection, the Initial Sequence Number $($ISN$)$ is chosen to be $5000.$ The client sends a SYN packet to initiate the connection, and the server responds with a SYN$-$ACK packet, acknowledging the client's ISN and providing its own ISN, which is $8000.$ After receiving the SYN$-$ACK, the client sends an ACK packet.

What will be the acknowledgment number in the ACK packet sent by the client?

Question $16$ options:

$5001$

$10001$

$8001$

$8064$