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An entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.This is called as

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An entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.This is called as

(a) One-to-many

(b) One-to-one

(c) Many-to-many

(d) Many-to-one

This question was addressed to me by my college professor while I was bunking the class.

Enquiry is from Constraints in portion Database Systems Design and Implementation of Database Management

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Correct choice is (b) One-to-one

The explanation is: Here one entity in one set is related to one one entity in other set.

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