Suppose in a hypotbetical computer,t noted by alphabetic characters A acconding to the order of their addresses. The cache contains 4 lines, umbered as,1, 2 and 3. he main IDey contains 8 blocks, de To design the cache mapping mechanism and cache replacement algorithm, we use a special program for this program is as: for test. The sequence of memory access (to the blocks) AD D CCBABEF AADDCFACDD EDBBDGDBC If this systen use direct mapping, we kow that blocks A and E in the main memory are mapped to line 0 in the cache, blocks B and F to line 1, blocks C and G to line 2, and blocks D and to line 3 Follom the idea in Example 4.5.7, please using the following chart to analye the cache usage (e, marking a cache replacement with the alphabetic block number, and marking a hit with +). Then, caleulate the hit ratio if choose direct mapping 5 H B B DBE B B E DBB