In G$-$back$-N,$ if the window size is $100,$ the BER is ${10}^{-4}$ and the

frame length is $1000$ bits, what will be the expected number of

transmissions of a frame?

$($a$)0\mathrm{.}9$

$($b$)12\mathrm{.}11$

$($c$)1\mathrm{.}11$

$($d$)1\mathrm{.}2$