Which of the following of the following is a true statement about a stack and heap?

Which of the following of the following is a true statement about a stack and heap?
A . Heaps can allocate a block of memory at any time and free it at any time.
B . Stacks can allocate a block of memory at any time and free it at any time.
C . Heaps are best for when you know exactly how much memory you should use.
D . Stacks are best when you don’t know how much memory to use.

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Answer: A