3 b.. Convert the following formula from infix to postfix (Reverse Polish Notation): ( A + B * C) / ( D + E * F) (A+B*C)(D+E*F)/ (A+BC*)(D+EF*)/ ABC*+DEF*+/ For Problem 4, write code that performs the computation used in problem 3b ( A + B * C) / ( D + E * F) for using CPUs that have the following instruction formats: 4 a. Three-operand instructions You may only use registers A through F, plus X and T. Registers A through F may not be changed, i.e. their values are fixed. Register T may be used as a temporary register, and Register X must contain the final answer. 4 b. Stack instructions (I need the 3 operand (4a) and stack(4b) instructions. The last answer didn't give me what I needed)