The electric field part of an electromagnetic wave in a medium is represented by ${\mathrm{E}}_{\mathrm{x}}=0;$

${\mathrm{E}}_{\mathrm{y}}=2.5\frac{\mathrm{N}}{C}\cos \left[\left(2\pi \times {10}^6\frac{\mathrm{rad}}{\mathrm{m}}\right)\mathrm{t}-\left(\pi \times {10}^{-2}\frac{\mathrm{rad}}{\mathrm{s}}\right)\mathrm{x}\right]$ ${\mathrm{E}}_{\mathrm{z}}=0$ The wave is :

moving along x direction with frequency ${10}^6$ Hz and wave length 100 m.

moving along x direction with frequency ${10}^6$ Hz and wave length 200 m.

moving along – x direction with frequency ${10}^6$ Hz and wave length 200 m.

moving along y direction with frequency $2\pi \times {10}^6 \mathrm{Hz}$ and wave length 200 m.