We consider a WLAN in which the maximum propagation delay is $4$sec$.$ The WLAN operates at a data rate of $10$ Mbps$.$ The data and ACK packets are of $400$ and $20$ bits, respectively. The processing time for a data or ACK packet is $1$sec$.$ If the probability p that a data packet or its ACK can be corrupted during transmission is $0\mathrm{.}01,$ find the data link protocol efficiency with $(1)$ Stop and Wait protocol $$ full duplex, $(2)$ SRP with window size W $=8,$ and $($SRP$=$Selective repeat$)(3)$ Go$-$Back$-$N protocol with window size W $=8.$ For Stop and wait protocol efficiency is given as;

Where T is the total transmission time, Tp is the data propagation time and p is the loss probability.