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Hash tree is also known as _____

(a) Merkle tree

(b) T -tree

(c) Hash table

(d) B^x-tree

My question is based upon Hash Tables topic in portion Hash Tables of Data Structures & Algorithms I

I have been asked this question in an interview for internship.

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The correct choice is (a) Merkle tree

To explain: Hash tree is generally known as Merkle tree after Ralph Merkle who patented it in 1979. Typically Merkle trees have a branching factor of 2, meaning that each node has up to 2 children.

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