An existing system is being extensively enhanced by extracting and reusing design and program
components. This is an example of:

A.
reverse engineering.

B.
prototyping.

C.
software reuse.

D.
reengineering.

Explanation:
Old (legacy) systems that have been corrected, adapted and enhanced extensively require
reengineering to remain maintainable. Reengineering is a rebuilding activity to incorporate new
technologies into existing systems. Using program language statements, reverse engineering
involves reversing a program’s machine code into the source code in which it was written to identify
malicious content in a program, such as a virus, or to adapt a program written for use with one
processor for use with a differently designed processor. Prototyping is the development of a system
through controlled trial and error. Software reuse is the process of planning, analyzing and using
previously developed software components. The reusable components are integrated into the

current software product systematically.