What Is the Difference Between a Normal Pulsar, Which Emits

What is the difference between a normal pulsar, which emits radiation in the radio range, and a pulsating X-ray source?

A) A pulsating X-ray source combines the characteristics of an ordinary pulsar and a variable star. The surface pulsates in and out creating a pulsating source.
B) A pulsating X-ray source is a binary system of two pulsars in very rapid rotation around one another. One sees the interference pattern of the two pulsar beams as a pulsating X-ray jet.
C) A pulsating X-ray source is an ordinary pulsar, but occasionally, when the neutron star experiences a glitch and the crust cracks, the hot interior is exposed and emits an intense beam of X-rays.
D) A pulsating X-ray source is a pulsar with a binary companion. Matter pulled off the companion spirals along the intense magnetic field of the pulsar, and its interaction with the surface produces X-ray jets.