Aminoglycosides are effective against which strain of bacteria?

A. Aminoglycosides are ineffective against viral infections, as they target bacterial pathogens. B. While some aminoglycosides may have activity against certain Gram-positive bacteria, they are mainly used for Gram-negative infections. C. Fungal infections require antifungal agents, not aminoglycosides. D. Aminoglycosides are primarily effective against Gram-negative bacteria, making them valuable in treating serious infections caused by these organisms.