4.[6 points) Use the register and memory values in the table below for this question. Assume a 32-bit machine. Assume each of the following questions starts from the table values; that is, DO NOT use value changes from one question as propagating into future parts of the question Register Value Memory Location Value RI 12 12 16 R2 16 16 20 R3 20 20 24 R4 24 24 28 a) Give the values of R1, R2, and R3 after this instruction: add R1, R2, R3 b) What values will be in RI and R3 after this instruction is executed: lw R2, 8(RIC) What values will be in R2 and R4 after this instruction is executed: addi R2, R4,W16