According to the unified model of active galactic nuclei, ___________ is in the center surrounded by _____________with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle
a. a supermassive black hole; an accretion disk
b. a supermassive black hole; empty space
c. no black hole; an accretion disk
d. no black hole; empty space
a
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