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What is the advantage of expressing API components as maps?

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What is the advantage of expressing API components as maps?

(a) Easy maintenance

(b) Easy accessibility

(c) Limited usage of resources

(d) Limited constraints

The question was asked in a job interview.

Query is from Architecture Maps in portion Cognitive Radio Architecture of Cognitive Radio

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Right answer is (d) Limited constraints

Easiest explanation: API defined as a map lists the methods and the procedure applicable for subsets s1 of a domain that map onto subsets s2 of a range.  This enables easy establishment of API while avoiding the constraints the limit the application of API in cognitive radio.

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