Answer:
D. The oldest and perhaps best-known system building tool is "Ant", which was originally developed in the 1970s for Unix.
Step-by-step explanation:
Ant often referred to Apache Ant is a computer software tool, though popularly considered oldest, was originally first built in the year 2000 by Unix, on Java platform, which is utilized as a component of plug-in development.
Hence, given the available options, the correct answer is Option D, because, Ant originally built in the year 2000 and not the year 1970, while the other statements are definitely correct.