From an Observational Standpoint, What Is a Pulsar

From an observational standpoint, what is a pulsar?

A) a star that slowly changes its brightness, getting dimmer and then brighter, with a period of anywhere from a few hours to a few weeks
B) an object that emits flashes of light several times per second (or even faster) , with near perfect regularity
C) a star that changes color rapidly, from blue to red and back again
D) an object that emits random "pulses" of light, sometimes with only a fraction of a second between pulses and other times with several days between pulses

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