Which statements are accurate regarding methicillin-resistant Staphylococcus aureus (MRSA) skin infections?

a. Trimethoprim-sulfamethoxazole (Bactrim) PO is an appropriate option for treatment
b. MRSA infection has only been identified in patients with recent hospitalizations
c. MRSA is usually not associated with abscess formation
d. Cefalexin (Keflex) PO is the 1st drug of choice