Assume the system with 256B memory and 64B cache and the block size of 16 bytes. I. e., there are 4 blocks in the cache. (a) For direct-mapped cache, 8-bit memory addresss is decomposed of ___-bit tag, ___-bit index, and ___-bit block offset. (b) For fully associative cache, 8-bit memory addresss is decomposed of ___-bit tag, ___-bit index, and ___-bit block offset. (c) For 2-way set associative cache, 8-bit memory addresss is decomposed of ___-bit tag, ___-bit index, and ___-bit block offset. Assume the system as question 1. Assume cache is initially empty, i. e., all 4 cache blocks are invalid. Consider the memory reference sequence: D6, 58, D8, 9A, DE, 5C.(a) Indicate if it is a hit or misss for each memory reference if it is direct-mapped cache. What is the miss ratio