A current flows into a parallel combination of $4\mathrm{.}0$Omega$,6\mathrm{.}0$Omega$,$ and $12$Omega resistors.

$($a$)$ Draw the circuit diagram of the parallel combination of resistors. 

$($b$)$ What current flows through the $12-$Omega resistor?

$($c$)$ What current flows through the $4\mathrm{.}0-$Omega resistor? 

$($d$)$ What is the voltage across $6\mathrm{.}0-$Omega resistor?