A block of memory that uses a fixed memory allocation to store data is known as what?

• A. Memory Heap
• B. Cache
• C. Memory Register
• D. Memory Stack

Answer: (D)

Memory regions that allocate data in fixed-size blocks and reclaim them in a last-in, first-out order are the stack. When a function runs, a stack frame containing its local variables is pushed onto the stack; the frame size is determined (typically at compile time) and memory is released quickly as the function returns by popping that frame. This automatic, fast, and predictable allocation contrasts with the heap, where memory is allocated and freed dynamically in any order. The cache is a small, fast memory near the CPU used to speed up access, not a general-purpose memory block for storing data, and registers are tiny storage inside the CPU for immediate computations. So, the block described fits the stack mechanism.