The mass of the candidate black hole at the center of the galaxy NGC 4261 was estimated from the:
A) application of Kepler's laws to the orbital speed of objects close to this center.
B) intensity of x rays from it and the speed at which the x rays flicker.
C) amount of mass that is disappearing into it per year.
D) periodic shift in the wavelengths of spectral lines from a companion object around which the black hole is orbiting.
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