The electric field of an electromagnetic wave in free space is given by E→=10 cos107t+kxj^  V/m, where t and x are in seconds and metres respectively. It can be inferred that1) the wavelength λ is 188.4 m2) the wave number k is 0.33 rad/m.3) the wave amplitude is 10 V/m.4) the wave is propagating along + x direction.Which one of the following pairs of statements is correct ?