$2.-$ Explain in words the operations specified by the following register transfer notation:$5$ pts$.$a$)$ R$2<-$ R$2+1,$ R$1<-$ R$2$b$)$ R$3<-$ R$3-1$c$)$ If $($T$1=1)$ then $($R$0<-$ R$1)$ else if $($T$2=1)$ then $($R$0<-$ R$2)$Flip$-$flop excitation tablesQ$($t$)$Q$($t$+1)$JK$000$X$011$X$10$X$11$Xa$)$ JK$0$Q$($t$)$Q$($t $+1)$T$00001110111$b$)$T$0$