Which of the Following Statements Is True Concerning Dark-Field Microscopy

Which of the following statements is true concerning dark-field microscopy?

A) This type of microscopy uses specific stains to enhance the contrast of certain bacteria.
B) The condenser does not allow light to pass directly through the specimen but directs the light to hit the specimen at an oblique angle.
C) Dark-field microscopy allows the visualization of larger viruses.
D) Dark-field microscopy can differentiate various difficult-to-grow organisms by using immunofluorescence.