You received a report that states an E$-$test was performed on the bacterium isolated from the sputum sample you sent to the clinical lab. What was done and what was measured?

A disc diffusion assay to measure germicide efficacy: the bacterial isolate was grown on a solid growth medium and filter discs with antibiotics were deposited on the solid growth medium

An antibiotic diffusion test to measure antibiotic susceptibility: the bacterial isolate was grown on a solid growth medium and a filter$-$paper strip with an antibiotic was deposited on the solid growth medium

An antibiotic diffusion test to measure antibiotic production: the bacterial isolate was grown on a solid growth medium and a filter$-$paper strip with an antibioticproducing fungus was deposited on the solid growth medium

A microbroth dilution to measure antibiotic susceptibility: the bacteria were grown in a liquid medium containing $2-$fold dilution of antibiotics