The eiectric field intensity E and magnetic field intensity H are coupled and propagating in free space in x and y direction respectively, the Poynfing vector is given by-

A

$$ EH\widehat{x} $$

B

$$ EH\widehat{y} $$

C

$$ EH \widehat{x} \widehat{y} $$

D

None of the above