Each of the following helps reduce the spread of . difficile infections in healthcare, EXCEPT
a. Using over-the-counter hand-sanitizer after treating a patient with C. diff
b. Improving the prescribing of antibiotics
c. Rapidly identifying and isolating patients with C. diff
d. Cleaning surfaces with EPA-approved endospore-killing disinfectants
e. Wearing gloves and gowns when treating patients with . diff