Which best describes a dilution test used to estimate disinfectant effectiveness? 1.Disinfectant is placed in a 2mm well on a agar platehat has a lawn of bacteria covering the plate to measure survival 2.Serially diluted disinfectants are inoculated with microbes then followed by culturing for survival 3.Disinfectant is placed on small paper discs then placed on agar plates containing a lawn of bacteria to measure survival 4.Microbe-contaminated stainless steel carriers are immersed in a disinfectant 'or to minutes then followed by culturing for survival.