The statement i.e. true with respect to the constructive interference diagram should be that the two waves should be overlapped.
What is the constructive interference?
At the time when two waves of the same kind of wavelength should be in phase so they created the new wave along with the amplitude that should be equivalent to the sum of the inidvidual amplitudes so this we called as the constructive interference
As per the given diagram, we can say that the crest for two waves that should be overlapped should be considered.
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