What does it mean to say that a microscope does NOT have a resolution less than 200 nanometers?

A.
The microscope has a magnification of 200 nanometers.

B.
The microscope can only distinguish between two objects that are 200 nanometers or more apart.

C.
The microscope can only distinguish between two objects whose light and dark areas differ in intensity by 200 nanometers.

D.
The microscope can only be used to examine specimens that are 200 nanometers or smaller.