D Using a flip flop, the input is used as the BCD code counter when the value is $0,$ and as the BCD code counter when it is $1.$Design the $[2421]$ code counter and convert it into a package $($IC$)$ circuit. a$)$ Create the state tables using your relevant flip$-$flops?b$)$ Using K$-$Maps, find the functions of the flip$-$flop input$($s$)$ for each input value $($x $=0$ and $1)?$c$)$ Design your relevant meter using your 'Logicly' program?d$)$ Convert it to a package $($IC$)$ counter circuit with Reset, Clock, Start$/$Stop$,$ Up$/$Down inputs?e$)$ Perform the counting operation on the $7-$segment display.?