Which of the following is an example of innate immunity? A. Secretion of mucus and detergent bile salts by the GI epithelia B. Filtering mechanisms like the spleen C. Attack of virus-infected cells by...

Which of the following is an example of innate immunity?

A. Secretion of mucus and detergent bile salts by the GI epithelia

B. Filtering mechanisms like the spleen

C. Attack of virus-infected cells by NK cells

D. Production of antibodies by B lymphocytes