List of top Signals and Systems Questions on Fourier Transform - Energy Spectral Density and Bandwidth

Consider a real baseband signal \(x(t)=e^{-2t}\), for \(t\) (in seconds) \(\ge0\).
If \(99\%\) of the energy of \(x(t)\) lies within \(B\) Hz, then which of the following options is TRUE for the value of \(B\)?