What Is the Difference Between an Optical Double Star and a Visual

Multiple Choice

What is the difference between an optical double star and a visual binary star?

A) There is no difference: They are two names for the same thing.
B) Optical double stars can be seen as separate stars only through a telescope,whereas visual binaries can be seen with the unaided eye (e.g. ,the star Mizar in the Big Dipper's handle) .
C) The stars in an optical double star are actually orbiting each other,whereas a visual binary is an illusion: The stars are at vast distances from each other and are not actually orbiting each other.
D) An optical double is an illusion: The stars are at vast distances from each other and are not actually orbiting each other,whereas in a visual binary,the stars are actually orbiting each other.