Consider the following information:

1 hour = 3.6×10³ seconds
1 day = 24 hours
1 year = 3.65×10² days

Use scientific notation to calculate the number of seconds in one day.

a) 8.64×10⁴ seconds
b) 0.864×10¹ seconds
c) 8.64×10³ seconds
d) 86.4×10⁴ seconds