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Which of the following is the most widely used external memory data structure?
1) AVL tree
2) B-tree
3) Red-black tree
4) Both AVL tree and Red-black tree

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Answer: b
Explanation: In external memory, the data is transferred in form of blocks. These blocks have data valued and pointers. And B-tree can hold both the data values and pointers. So B-tree is used as an external memory data structure.

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