Which of the following statements would NOT be a proper definition for a Trojan Horse?

Which of the following statements would NOT be a proper definition for a Trojan Horse?
A . An authorized program that has been designed to capture keyboard keystroke while the user is unaware of such activity being performed
B . An unauthorized program contained within a legitimate program. This unauthorized program performs functions unknown (and probably unwanted) by the user
C . A legitimate program that has been altered by the placement of unauthorized code within it; this code performs functions unknown (and probably unwanted) by the user
D . Any program that appears to perform a desirable and necessary function but that (because of unauthorized code within it that is unknown to the user) performs functions unknown (and definitely unwanted) by the user

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Answer: A