A communication node uses the selective$-$reject ARQ protocol

and the node finishes transmitting before it receives a negative

acknowledgment for frame $101($SREJ $101).$ In this case the

transmitter needs to:

$($a$)$ retransmit frame $101$ only $($b$)$ retransmit frame $101$ and all

subsequent frames $($c$)$ retransmit frames $1$ to $101($d$)$ neither a

nor b nor c$.$