3. Consider a Cache with nominal size 512KByte, and 4 words per block. The main memory address is 32 bits wide. How many blocks does it hold? How many bits would the offset need? Consider these cases: Direct Mapped, 2-way set associative, 4-way set associative and fully associative. Calculate the size of the index and the tag for each case. Calculate de real space in bytes that the cache uses. The additional information saved per block is the tag plus three status bits. How does the number of sets affect the size of the cache?