Question: Assume pointer variable p points to node x of a linked list, and node x ' s next pointer points to node y . What

Assume pointer variable p points to node x of a linked list, and node x's next pointer points to node y. What does free(p) operation mean?
Group of answer choices
return the memory held by x and by y to the free memory pool.
return the memory held by x to the free memory pool.
set pointer p to 0.
return the memory held by x to the free memory pool and set pointer p to 0.

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