Two light sources are said to be coherent if they are obtained

Options :
  1. from the different point sources emitting light of same wavelengths
  2. from a point source
  3. from an extended source
  4. None of the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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I mean, after all, you have to consider we're only made out of dust. That's admittedly not much to go on and we shouldn't forget that. But even considering, I mean it's sort of a bad beginning, we're not doing too bad. So I personally have faith that even in this lousy situation we're faced with we can make it. You get me?
-Philip K. Dick The Three Stigmata of Palmer Eldritch