Which of the following best defines the polarization of a wave?
a) The property of a wave that determines whether its oscillations are longitudinal or transverse.
b) The change in wavelength of a wave when it moves from one medium to another.
c) The restriction of a transverse wave’s oscillations to a single plane perpendicular to its direction of propagation.
d) The orientation of the electric field vector relative to the magnetic field vector in an electromagnetic wave.