Consider an X- Ray Binary System in Which a Compact

Consider an X- ray binary system in which a compact object, surrounded by an accretion disk, is in a binary orbit with another star. All of the following statements about such accretion disks are true except:

A) The compact object may be either a neutron star or a black hole.
B) The radiation from an accretion disk may vary rapidly in time.
C) The accretion disk consists of material that spills off the companion star.
D) Several examples of flattened accretion disks being "fed" by a large companion star can be seen clearly in photos from the Hubble Space Telescope.
E) X- rays are emitted by the hot gas in the accretion disk.