Pleаse use the fоllоwing scenаriо to аnswer the related question parts below. A patient is infected with a Staphylococcus aureus for the very first time. They do not have any vaccinations or previous infections which confer immunological memory for this infection. A) What are two APCs that might interact with the whole pathogen during this primary infection? What approach to the pathogen will each of these APCs take? B) A B cell encounters the bacterium swimming freely in the blood stream. Describe the two cells that the B cell will differentiate into upon activation by the pathogen. What is the first type of immunoglobulin that will be produced after differentiation? What is the second?