What does an abstract data type (ADT) specify?
Correct answer D. The operations on the data and their behaviour, without fixing the implementation
Explanation
An ADT is defined by what you can do with the data, such as push and pop for a stack, and how those operations behave. It deliberately hides how they are implemented, so the same stack ADT can be built on an array or a linked list. Memory layout and instruction choices belong to a concrete data structure, not to the ADT itself.
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