$[$Qid $11](6$ points$)$ In the circuit below all capacitors are uncharged and the switch has been open for a long

time. At t$=0$ the switch is closed. What is the potential difference V$\_($a$)-$V$\_($b$)$ between a and b after the switch

has been closed for a long time.

$($A$)-12$ V

$($B$)-8$ V

$($C$)0$ V

$($D$)+4$ V

$($E$)-4$ V

$($F$)+12$ V

$($G$)+8$ V