3. (6 points) You are evaluating three branch prediction strategies: (1) predict always taken, (2) predict always not taken and (3) use the 2-bit branch predictor. Experimentally, your measurements show that conditional branches account for 20% of all instructions and 70% of all branches are taken. The 2-bit predictor has an accuracy of 70%. Assuming that the penalty of a mis-prediction is 4 cycles and 0 cycles for a correct prediction, compute the average stall cycles per instruction of the three strategies. stall cycles/instruction prediction strategy always taken always not taken 2-bit predictor