Consider the DoSomething method below.public static int DoSonething $($int a$,$ int b$)$if $($a $==0)$return$1$;elsereturn a $*$ DoSomething $($a$-1,$b$)$;What is the action of the method DoSomething?O a$.$abO b$.$ a$!($a factorial$)$O c$.$ baO d$.$ a$+$bOe. a $*$ b