Question: The recommended antibiotic treatment for acute diarrhea caused by Clostridium difficile is: 
 Options:  <1> Administer vancomycin orally. <2> Administer vancomycin intravenously. <3> Administer ciprofloxacin orally. <4> Administer metronidazole orally. <5> Administer rifaximin orally.
4