Post-Exposure Prophylaxis Is the Treatment Given to an Individual

Post-exposure prophylaxis is the treatment given to an individual:

A) Prior to infection, to prevent the disease
B) Too long after a potential exposure to a pathogen. It cannot effectively prevent a disease
C) After a potential exposure to a pathogen, to prevent the disease
D) After a potential exposure to a pathogen, to boost the immune system by stimulating the release of memory cells.