Problem $6\mathrm{.}1$ d $)$ Calculate the current $\backslash ($ I$\_\{$x$\}\backslash )$ in the circuit shown below.

$($A$)4$ A

$($B$)3\mathrm{.}5$ A

$($C$)7$ A

$($D$)1\mathrm{.}7$ A