Here is a Java function. public int process(int n) { if (n e) return 0; else insert operator here process (n-1); return n The function is used in this line of code: System.out.println(process(5)); An operator is deliberately not shown in the code. If the above line of code produces the output 120 , what will be the operator used in the code? You need to write the answer clearly in the box below