In a demonstration for the class, Ms. Bolton puts a drop of…

In a demonstration for the class, Ms. Bolton puts a drop of blood in each well of a blood typing tray.  She then adds anti-A antibody to the A well, anti-B antibody to the B well, and anti-Rh antibody to the Rh well.  You observe agglutination in the A and Rh wells, but not in the B well (see above).  What is her blood type? _______