Solve the Exponential Equation by Using the Property That Bx $$4 ^ { - x } = 256$$

Multiple Choice

Solve the exponential equation by using the property that bx = by implies x = y, for b > 0 and b≠ 1. $$4 ^ { - x } = 256$$

A) $\{ - 4 \}$
B) $\{ 64 \}$
C) { }
D) $\{ 4 \}$