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  1. What if size is zero in the following C statement?
    realloc(ptr, size)
    1. Doesn’t do any reallocation of ptr i.e. no operation
    2. Undefined behaviour
    3. Allocate a memory location with zero length
    4. Free the memory pointed to by ptr
    5. None of these
Correct Option: D

Free the memory pointed to by ptr


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