When We See X-Rays from an Accretion Disk in a Binary

When we see X-rays from an accretion disk in a binary system,we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole.Suppose we then observe each of the following phenomena in this system.Which one would force us to immediately rule out the possibility of a black hole?

A) bright X-ray emission that varies on a time scale of a few hours
B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths
C) sudden,intense X-ray bursts
D) visible and ultraviolet light from the companion star

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