Discussion
Consider the case that a record is read by another, which is moved or deleted and it contains a pointer, then that pointer is called as :
Answer: C
Such a pointer is called a dangling pointer.
If a record holding a pointer to another record keeps that pointer after the target has been moved or deleted, the pointer now refers to a location that no longer holds the intended record. That is a dangling pointer, and following it gives wrong data or an error. Database systems avoid it with tombstones or indirection through record identifiers.
A dynamic pointer is just one allocated at run time, a pointer to pointer holds the address of another pointer, and 'unlinked pointer' is not a standard term.
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