John Holland is known for the invention of

Options :
  1. Radar
  2. Modern Submarine
  3. Anti Tank Missiles
  4. Xerox Machine
Answer and Explanation :-

Answer: Option 2

Explanation:

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Happiness is good, but well-overrated: what we hate most are the very motivators that put us in gear. A man drifts along with little to contribute until something agitates him enough to make a difference, whether for himself or for his communities.
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