Normal Bacterial Inhabitants of the Human Body

Normal bacterial inhabitants of the human body

A) are naturally resistant to antibiotics.
B) are able to out-compete some invading pathogens and thus are one of the body's initial defense mechanisms.
C) can be transformed into pathogenic forms if a person's resistance to disease is low.
D) are unable to survive the human body's defense mechanisms.
E) are able to out-compete some invading pathogens and thus are part of the body's innate immunity.