Two communication nodes use the Go$-$Back$-$N ARQ protocol with a window size of $500.$ Frames $1$ to $500$ are sent, but frame $500$ is received in error. In this case the transmitter needs to:

$($a$)$ retransmit frame $500$ only

$($b$)$ retransmit frame $1$ and all subsequent frames $($c$)$ retransmit frames $1$ to $500($d$)$ neither $a,b$ or $c.$