Express the product (4×103)(5×105)(4 \times 10^3)(5 \times 10^5)(4×103)(5×105) in standard form.
2,000,000,0002{,}000{,}000{,}0002,000,000,000
20,000,000,00020{,}000{,}000{,}00020,000,000,000
200,000,000200{,}000{,}000200,000,000
2,000,0002{,}000{,}0002,000,000