A motion is described by \( y=3 e^{x} \cdot e^{-3 t} \) where \( y, x \) are in metre and \( t \...

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A motion is described by \( y=3 e^{x} \cdot e^{-3 t} \) where \( y, x \) are in metre and \( t \) is in second :
(A) This represents equation of progressive wave propagating along \( -x \) direction with \( 3 \mathrm{~ms}^{-1} \)
(B) This represents equation of progressive wave propagating along \( +x \) direction with \( 3 \mathrm{~ms}^{-1} \)
(C) This does not represent a progressive wave equation
(D) Data is insufficient to arrive at any conclusion of this short
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