The patient is receiving intravenous gentamicin to treat a gram-negative infection. The nurse draws a gentamicin trough level immediately prior to the 4th dose; the result is 2.2 µg/mL. Which of the following conclusions would be most appropriate given this result?

The patient is at risk for hearing loss. The therapeutic gentamicin trough level is 0.5-2 µg/mL. At greater than 2 µg/mL, the patient is at risk for ototoxicity, neurotoxicity, and nephrotoxicity. The patient requires a lower and/or less frequent dosing of gentamicin, not a higher or more frequent dose. The patient is not at risk for liver failure with gentamicin.