**Core Concept**
Cefepime is a fourth-generation cephalosporin antibiotic with a broad spectrum of activity against both Gram-positive and Gram-negative bacteria. Its pharmacological properties allow it to achieve high concentrations in the central nervous system (CNS), making it an effective treatment for various CNS infections.

**Why the Correct Answer is Right**
Cefepime exerts its antibacterial effects by inhibiting cell wall synthesis through the binding of its beta-lactam ring to penicillin-binding proteins (PBPs) on bacterial cell walls. This prevents the cross-linking of peptidoglycan chains, ultimately leading to cell lysis and death. Cefepime's ability to penetrate the CNS is facilitated by its lipophilic properties and its ability to cross the blood-brain barrier.

**Why Each Wrong Option is Incorrect**
**Option A:** Not applicable, as the correct answer is missing.
**Option B:** Not applicable, as the correct answer is missing.
**Option C:** Not applicable, as the correct answer is missing.

**Clinical Pearl / High-Yield Fact**
Cefepime is generally not recommended for use in patients with creatinine clearance < 50 mL/min, as it can accumulate to toxic levels and increase the risk of nephrotoxicity. **Correct Answer:** (You need to provide the correct answer choices for options A, B, and C to complete the explanation.)