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What are legacy systems?

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What are legacy systems?

(a) new systems

(b) old systems

(c) under-developed systems

(d) none of the mentioned

I had been asked this question during an interview.

The doubt is from Software Maintenance in chapter Software Maintenance of Software Engineering

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Right option is (b) old systems

Easiest explanation: Legacy systems are the existing systems which may require some modification or maintenance.

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