At this instant, at which of the values of x in the drawing does the instantaneous Poynting vector have its maximum magnitude? (poll 11165492)

At this instant, at which of the values of x in the drawing does the instantaneous Poynting vector have its maximum magnitude?

A. x = 0 and x = λ only

B. x = λ/4 and x = 3λ/4 only

C. x = λ/2 only

D. x = 0, x = λ/2, and x = λ

E. none of the above

Other:

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