From a Theoretical Standpoint, What Is a Pulsar

From a theoretical standpoint, what is a pulsar?

A) a star that is burning iron in its core
B) a binary system that happens to be aligned so that one star periodically eclipses the other
C) a neutron star or black hole that happens to be in a binary system
D) a rapidly rotating neutron star
E) a star that alternately expands and contracts in size

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