Write the following number in scientific notation and round off to five significant figures: 0.00392708 x 10 81 .
a) 3.9271 x 10 84
b) 3.9270 x 10 78
c) 0.39271 x 10 78
d) 3.9270 x 10 80
e) 3.9271 x 10 78
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