(D) In scientific notation,the power of $10$ (i.e.,$10^{3}$) does not contribute to the number of significant figures. The significant figures are det

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(D) In scientific notation,the power of $10$ (i.e.,$10^{3}$) does not contribute to the number of significant figures. The significant figures are determined by the digits in the coefficient $7.964$. Since all digits $7, 9, 6,$ and $4$ are non-zero,they are all significant. Therefore,there are $4$ significant figures.