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8. Which of the following is a true statement about the relationship between the electric and magnetic fields in an electromagnetic wave? (a) One type of field goes in circles and the other goes in straight lines perpendicular to the circles. (b) The electric and magnetic fields are 90 degrees out of phase, (ie, sine vs cosine), but the magnitudes are independent c) There is a fixed relationship between the magnitudes of the cloctric and magnetic fields at all points in the wave, and they are in phase (a) Both electric and magnetic fields exist, but there is no relationship whatsoever between them (e) Either there are electric or magnetic fields, not both