Which of the Following Describes the 'Specificity' of a Test

Multiple Choice

Which of the following describes the 'specificity' of a test for a certain disease?

A) The probability that you are likely to have a specific disease, without any knowledge of your test results.
B) The proportion of people who correctly test positive when they actually have the disease.
C) The proportion of people who correctly test negative when they don't have the disease.
D) All of the above.