In urinary tract infections (UTIs), what is the implication of the ability of bacteria to actually hide urinary tract epithelial cells and form biofilms?

A) UTIs can never be cured.
B) A reservoir for reinfection is created.
C) The kidney will invariably be infected.
D) Intracellular pathogens are the etiologies for UTI.
E) The ureter is the usual route for bladder infection.