$1)$ Suppose an $802\mathrm{.}11$b station is configured to always reserve the channel with the RTS$/$CTS sequence. Suppose this station suddenly wants to $$transmit $5,000$ bytes of data, and all other stations are idle at this time. As a $$function of SIFS and DIFS, and ignoring propagation delay and assuming no bit errors, calculate the time required to transmit the frame and receive the acknowledgment.