A 64-year-old with first recurrence of CDI within 2 months after standard vancomycin responds to therapy but is high risk for another recurrence (age >65, CKD). Which adjunctive therapy reduces recurrence when added to standard-of-care antibiotics?AProbiotics containing Saccharomyces boulardiiBBezlotoxumab single IV dose during antibiotic courseCRifaximin chaser for 7 days after vancomycinDFecal microbiota transplant immediatelyEOral metronidazole in addition to vancomycinCheck my answer