Q$.4$ A uniform vec$(E)=(5$vec$(a{)}_x+j10$vec$(a{)}_y)e^{-j2z}\frac{V}{m}$ has a frequency of $50$ MHz in a lossless dielectric material for which ${}_r=1.$

The intrinsic impedance $$ is

$($A$)377$

$($B$)277$

$($C$)198$

$($D$)498$