. (30 points). For each of the following statements, write down the corresponding MIPS assembly code. For each statement, assume that the variables a ,b and care respectively stored into the registers $50, $s1 and $s2. You are not allowed to use any pseudo-instruction in your answer. You may use additional registers as operands. a) b) c) d) if(a >3); if(a >= b) c = a + 9801; if(a > b) c = ~b