Redo the above simulation with multi-tasks, let us select total 4 tasks, task A is 90, B is 10, C is 70, and D is 50 references. Analyze the effectiveness of different block replacement techniques by listing down the hit rate in each case. Analyze the effectiveness of different block replacement techniques (LRU, FIFO, RAND) for multi-tasks environment under each case (different blocks and n-way)