Modifications of membrane traffic in host cells by three bacterial pathogens are shown in the following schematic drawing. Indicate whether each of the following bacteria is represented by A, B, or C in the drawing. Your answer would be a three-letter string composed of letters A to C only, e.g. BCA.

( ) It is a common cause of food poisoning in humans.
( ) It causes the life-threatening lung infection tuberculosis.
( ) It is the cause of a type of pneumonia known as Legionnaire's disease.