System A needs to send a $10$ Mb file to system B using Selective$-$Reject ARQ network transport protocol. Both system A and B have buffers large enough to handle the sliding window protocol. Each packet will contain L $=1024$ bits of data the distance between A and B is d $=2$km$,$ the propagation velocity V $=2$ x $10^8$ m$/$sec$,$ and the transmit data rate is N $=500$ Mbps$,$ and the probability of an error P is $0\mathrm{.}001.$ What is the utilization rate of this transmission?

a$.11$

b$.4$

c$.10$

d$.2048$