A nested function calls another function $($plot$\_$function with parameter $aO)$ and is also called by another function. Given the code that follows RISCV calling convention, which sets of registers should be saved to make this program run more optimally. All the function knows is that the plot$\_$function uses $aO$ as a parameter, and its own caller passes a value in a$0.$ mv s$1,$ s$2$ is the pseudo instruction equivalent of: addi $s1,s2,0$What combinations should apply $($mark as all that are true$)$:reg$\_$set$1$ should include ra$,$ s$1,$ s$2,$ s$3$reg$\_$set$2$ is emptyreg$\_$set $2$ is: should include t$1$a$0$ doesn't need to be saved on the stackreg$\_$set $1$ is emptyonly t$1$ and ra need to be savedonly ra rieeds to be savedall s# registers should be savedall t# should be savedra does not need savingt$1$ needs to be saved.