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The electric field of an electromagnetic wave in free space is given by  where t and x are in seconds and metres respectively. It can be inferred that

(1) The wavelength $\mathrm{\lambda }$ is 188.4 m.

(2) The wave number 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 statement is correct ?

(a)  (3) and (4)                                    (b)   (1) and (2)

(c)   (2) and (3)                                   (d)   (1) and (3)

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