the kirby bauer disc diffustion test is routinely used to determine____
a) the susceptibility of a given bacterial strain to a battery of antimicrobial drugs
b) how rapidly a drug will spread inside the body to aid in determining the proper dose
c) the lowest concentration of a specific drug needed to prevent growth of a given bacterial strain in vitro
d) the lowest concentration of a drug that kills 99.9% of cells of a given bacterial strain in vitro