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Answer (D) is correct . Software from recognized sources should be tested in quarantine (for example, in a test/development machine or a stand-alone personal computer) because even vendor-supplied software may be infected with viruses. The software should be run with a vaccine program and tested for the existence of logic bombs, etc.

Answer (A) is incorrect because If viruses infect a system, the company should restore the system with authorized software, but this procedure does not minimize the likelihood of initial infection.
Answer (B) is incorrect because If viruses infect programs that the company created, it should recompile the programs from source code backups, but this procedure does not minimize the likelihood of initial infection.
Answer (C) is incorrect because Instituting program change control procedures is good practice but does not minimize the likelihood of the system’s being infected initially.