C-09-Q001mediumsingle_mcqWhat is the exact velocity of light in vacuum?a2.99792458×1082.99792458 \times 10^82.99792458×108 ms⁻¹b2.99×1092.99 \times 10^92.99×109 ms⁻¹c3.0×1073.0 \times 10^73.0×107 ms⁻¹d1.33×1081.33 \times 10^81.33×108 ms⁻¹