In the phenomenon of interference:

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(C) $1$. In the phenomenon of interference,the principle of conservation of energy holds true. The energy is redistributed from the regions of destruc

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$a, d$

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(C) $1$. In the phenomenon of interference,the principle of conservation of energy holds true. The energy is redistributed from the regions of destructive interference (dark fringes) to the regions of constructive interference (bright fringes),such that the total energy remains constant. Thus,statement $(a)$ is correct.$2$. For a stable interference pattern to be observed,the two light sources must be coherent,which implies that they must have the same frequency and a constant phase difference. Thus,statement $(d)$ is correct.$3$. Since both $(a)$ and $(d)$ are correct,the correct option is $(c)$.

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