Given the following design module

;module up$\_$down$\_$counter $($clk$,$ rst$,$ UpDwn, count$)$

$?$Which of the following is a valid instantiation of the design module

;up$\_$down$\_$counter mycounter $(.$clk$($CLK$),.$rst$($RST$),.$UpDwn$($UpDwn$),.$count$($COUNT$)).$a O

;up$\_$down$\_$counter mycounter $($count$,$ clk$,$ rst$,$ UpDwn$).$b O

;mycounter up$\_$down$\_$counter $(.$clk$($CLK$),.$rst$($RST$),.$UpDwn$($UpDwn$),.$count$($COUNT$)).$c O

;updown$\_$counter mycounter $($clk$,$ rst$,$ UpDwn, count$).$d O