The answer is A because you track everything.
A and B seem right but I believe that the answer is A
Medical Definition of Vaccination. Vaccination: Injection of a killed microbe in order to stimulate the immune system against the microbe, thereby preventing disease. … To immunize against viral diseases, the virus used in the vaccine has been weakened or killed.
Vaccines can be described as drugs, or medication, since that’s pretty much what it is. I’m sorry if I sound a little vague, but I don’t know much about this