The area of the Okhotsk Sea is 1.583 × 10^6 km^2. The area of the Indian Ocean is 7.3556 × 10^7 km^2. Find the total area. Write the final answer in scientific notation with the correct number of significant digits.

8.9386 × 10^13 km2
8.939 × 10^13 km2
7.5139 × 10^7 km2
7.514 × 10^7 km2