Assume that the duration in minutes of a telephone conversion follows the expo-nential distribution $${\text{f}}\left( {\text{x}} \right) = \frac{1}{5}{{\text{e}}^{ - \frac{{\text{x}}}{5}}},\,{\text{x}} \geqslant {\text{0}}{\text{.}}$$    The probability that the conversion will exceed five minutes is

A. $$\frac{1}{{\text{e}}}$$

B. $$1 - \frac{1}{{\text{e}}}$$

C. $$\frac{1}{{{{\text{e}}^2}}}$$

D. $$1 - \frac{1}{{{{\text{e}}^2}}}$$

Answer: Option A