A speech signal of $3\;kHz$ is used to modulate a carrier signal of frequency $1\;MHz$ , using amplitude modulation . The frequencies of the side band will be

Question

$\begin{array}{1 1} 1.003\;MHz\;and\;0.997\;MHz \\ 300 \;kHz\;and\;2997\;kHz \\ 1.003\;kHz\;and\;1000\;kHz \\ 1\;MHz\;and\;0.997\;MHz\end{array} $