The probability density function F(x) = ae^-b|x|, where x is a random variable whose allowable value range is from x = -∞ to x = +∞. The CDF for this function for x ≥ 0 is

A. $$\frac{a}{b}{e^{bx}}$$

B. $$\frac{a}{b}\left( {2 - {e^{ - bx}}} \right)$$

C. $$ - \frac{a}{b}{e^{bx}}$$

D. $$ - \frac{a}{b}\left( {2 + {e^{ - bx}}} \right)$$

Answer: Option B