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Which of the following is the most widely used external memory data structure?(a) AVL tree(b) B-tree(c) Red-black tree(d) Both AVL tree and Red-black treeQuestion is taken from B-Trees in portion B-Trees of Data Structures & Algorithms IThis question was posed to me in a job interview.

Answer»

Correct ANSWER is (b) B-tree

The BEST 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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