Multiply or Divide and Write Scientific Notation for the Result $\left(4 \times 10^{8}\right)\left(7 \times 10^{8}\right)$

Multiple Choice

Multiply or divide and write scientific notation for the result.
- $\left(4 \times 10^{8}\right) \left(7 \times 10^{8}\right)$

A) $28 \times 10^{64}$
B) $2.8 \times 10^{16}$
C) $28 \times 10^{17}$
D) $2.8 \times 10^{17}$