Given the following design module ;module up$\_$down$\_$counter $($clk$,$ rst$,$ UpDwn, count$)?$hich of the following is a valid instantiation of the design module

;$U{p}_{d}ow{n}_c$ounter mycounter $(count,clk,rst,$ UpDwn$).a$

;$u{p}_{d}ow{n}_c$ounter mycounter $(.clk(CLK),.rst(RST),.$UpDwn$(UpDwn),.$count$(COUNT)).b$

;mycounter $u{p}_{d}ow{n}_c$ounter $(.clk(CLK),.rst(RST),.$UpDwn$(UpDwn),.$count$(COUNT)).c$

;$updow{n}_c$ounter mycounter $(clk,rst,$ UpDwn, count$).d$