Which One of the Following Is a Proper Technique for the Use

Which one of the following is a proper technique for the use of a speculum during a vaginal examination?

A) Allow the labia to spread, and insert the speculum slightly open.
B) Insert one finger, and insert the opened speculum.
C) Press the introitus downward, and insert the closed speculum obliquely.
D) Spread the labia, and insert the closed speculum horizontally.