The nurse is caring for a client who is diagnosed with Acquired Immune Deficiency Syndrome and is severely immuno-compromised. Which intervention should the nurse use to best help prevent infection?

A. Standard and neutropenic precautions are essential in protecting severely immuno-compromised clients from exposure to infectious organisms. B. While ambulation promotes circulation and overall health, it does not directly prevent infection. C. Visitation may be safely allowed with proper infection control; restriction alone is not the most effective or primary measure. D. Passive range of motion helps prevent contractures, not infections.