The electric field of an electromagnetic wave in a medium is given by Ex= 0,  , Ez = 0,  and  $E_y=2.5V{m}^{-1} \left[\cos \left(2\pi x{10}^{6}rad{s}^{-1}\right)t-\left(\pi x{10}^{-2}{m}^{-1}\right)x\right]$, The wave is

• A

  Moving along x-direction with frequency ${10}^6$ Hz and wavelength 100 m

• B

  Moving along x-direction with frequency ${10}^6$ Hz and wavelength 200 m

• C

  Moving along -x-direction with frequency ${10}^6$ Hz and wavelength 200 m

• D

  Moving along y-direction with frequency ${10}^6$Hz and wavelength 200 m