Need help solving the below example!

Exercise 4. [30 Marks Consider a 64-bit computer with a simplified memory hierarchy This hierarchy contains a single cache and an unbounded backing memory. The cache has the following characteristics Direct-Mapped, Write-through, Write allocate. . Cache blocks are 4 words each . The cache has 256 sets. (a) [3 Marks] Calculate the cache's size in bytes. (b) [12 Marks] Consider the following code fragment in the C programming language to be run on the described computer. Assume that: program instructions are not stored in cache, arrays are cache-aligned (the beginning of the array aligns with the beginning of a cache line), ints are 32 bits, and all other variables are stored only in registers int N 32768 int A[N]; for (int i 0;