What is (1.2×10−3)×(3.0×107)(1.2 \times 10^{-3}) \times (3.0 \times 10^7)(1.2×10−3)×(3.0×107)?
3.6×1043.6 \times 10^43.6×104
3.6×10−43.6 \times 10^{-4}3.6×10−4
4.2×1044.2 \times 10^44.2×104
3.6×10213.6 \times 10^{21}3.6×1021