An $8$ hour tech support shift $(1$ hour breaks$)$ handled $40$ requests despite a $30$ minute network crash. If the value added response time is $6$min, with $\frac{1}{200}$ replies inaccurate, the OEE is:

a$.94\%$

$-$b$.73\%$

$-$c$.63\%$

$.*$d$.57\%$