When We Say That an Electromagnetic Field Is "Quantized," We

Multiple Choice

When we say that an electromagnetic field is "quantized," we mean that it

A) is allowed to have only certain particular values of total energy.
B) it is really made of particles known as electrons.
C) it is really made of particles known as photons.
D) it fills up a region of space.
E) it vibrates at one particular frequency.