A clinical microbiologist receives a sputum $($spit$)$ sample from a sick patient. The physician suspects a Staphylococcus infection, but wants to know if it's an methicillin$-$resistant strain.The microbiologist takes the sputum sample, spreads it on a slide, and probes the cells for a specific methicillin$-$resistance gene. Some of the cells glow, indicating a positive result. The patient has methicillin$-$resistant Staphylococcus aureus $($MRSA$).$Based on this scenario, select all $(4$ answers$)$ that are true.The microbiologist performed an ELISA test.The microbiologist performed a FISH test.The microbiologist could culture the cells in a growth medium with methicillin added, to see if they grow. This would be an example of a differential medium.The microbiologist could also use PCR to detect the methicillin$-$resistance gene.The microbiologist could culture the cells in a growth medium with methicillin added, to see if they grow. This would be an example of a selective medium.If the microbiologist did a Gram stain, she would see clusters of purple spheres.If the microbiologist did a Gram stain, she would see chains of pink spheres.The microbiologist could also use phage typing to detect the methicillin$-$resistance gene.