Write the Number in Scientific Notation $6.3 \times 10 ^ { 7 }$

Multiple Choice

Write the number in scientific notation. 0.00000063

A) $6.3 \times 10 ^ { 7 }$
B) $63 \times 10 ^ { - 8 }$
C) $0.63 \times 10 ^ { - 6 }$
D) $6.3 \times 10 ^ { - 7 }$