The algorithm R_Mod receives as input arguments two integers, a and b, and returns a%b (a modulus b). For example, the result of R_Mod(5,3) is 2. What fragment of code replaces Z? function R_Mod(a,b) if z return a if(b==0) print("div by zero not possible") return return R_Mod(a-b,b) end function Select one: a. ab e. a==0