What Kind of Orbits Can Exoplanets in Binary Star Systems

Multiple Choice

What kind of orbits can exoplanets in binary star systems have?

A) Astronomers do not know, because none have been detected so far.
B) They orbit only one of the stars.
C) They have an orbit around the center of mass of both stars.
D) Some orbit one of the stars, while some have an orbit around the center of mass of both stars.