One Way to Describe the "Allowed" Matter Fields for an Isolated

One way to describe the "allowed" matter fields for an isolated hydrogen atom is that they are

A) the possible standing waves that will just "fit" around the nucleus.
B) the patterns that are spherically symmetric relative to the nucleus.
C) the possible shapes of the electron's charge that will just "fit" around the nucleus.
D) the electromagnetic fields that can be produced by the orbiting electron.
E) the various possible elliptical shapes for the orbit of the electron.