The utilization of a data link between two machines using the sliding$-$window technique is expressed as follows:

Assume that the propagation delay over this link is $3ms.$ The source generates frames of size $1000$ bits and operate at $1Mbps.$ A window size of $1$ is used. The utilization in this system is:

a$.87\mathrm{.}5\%$

$($b$.)14\mathrm{.}28\%$

c$.100\%$

d$.$ None of the above