Light waves are described as electromagnetic waves by Maxwell's equations and are characterized by three vector quantities: electric field, magnetic field, and the speed and direction of propagation of the energy of the wave. Which of the following statements is true about the relationship between the three vector quantities mentioned above for electromagnetic waves? a. The E field and B field oscillate parallel to one another and parallel to the propagation vector, as well. b. Whereas the E and B fields are always perpendicular to one another, the E field is at all times either parallel or anti-parallel to the propagation vector. c. The E and B fields oscillate perpendicular to one another, and both are orthogonal to the propagation vector. d. Whether the E field, B field, and propagation vector are parallel or orthogonal to one another depends on the polarization of the light wave.