A and $B$ are hidden terminals of each other, and $C$ is within both A and $B\text{'}$s transmission range. If $C$ sent an RTS to $A$ at $t=0,$ and $B$ wants to communicate with $D$ at $t=0\mathrm{.}5,$ then $B$ should wait until $t=$ to send its data to $D.$ Suppose the RTS$/$CTS transmission and propagation occupies one time slot.