Rewrite the Number or Expression as Requested $2.79 \cdot 10 ^ { - 4 }$

Rewrite the number or expression as requested.
- $2.79 \cdot 10 ^ { - 4 }$ (Rewrite as a standard numeral.)

A) 0.00279
B) 0.0000279
C) -279,000
D) 0.000279