The plane wave propagating through the di-electric has the magnetic field component as $$H=20 e^{-ax} \cos (\omega t-0.25) a_{y} \frac{A}{m}$$ $$ (a_{x},a_{y},a_{z}$$, are the unit vectors along x, y and z axis respectively ) Determine the Polarization of the wave

A

$$a^{x}$$

B

$$-a^{z}$$

C

$$\frac{a^{x}+a_{y}}{2}$$

D

$$a_{y}$$