Which best describes the action of vancomycin [vancocin]?

The best description would be; Vancomycin inhibits cell wall synthesis promoting bacterial lysis.  Vancomycin is an antibiotic that is used to treat quite a number of bacterial infections. It inhibits cell wall synthesis and promotes bacterial lysis and the death of the bacteria. It does not contain a beta lactam ring, therefore an effective serum trough level is 10 mcg/mL to 20 mcg/mL depending on the severity of the infection and renal function. The drug is an alternative to use in patients allergic to beta-lactam antibiotics.

The answer is d i think