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Kinds of software maintenance

Briefly illustrate the kinds of software maintenance? 

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The various kinds of software maintenance are as follows:

a) Corrective maintenance: It signifies the maintenance for correcting the software mistakes.

b) Adaptive maintenance: It signifies the maintenance for adapting the modification in the environment.

c) Perfective maintenance: It signifies modifying or improving the system to meet the new needs.

d) Preventive maintenance: It signifies the modifications made to enhance the future maintainability.

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