Content caching reduces traffic by storing content locally. The macOS Deployment Reference states, "To maximize the effectiveness of content caching, use MDM to enforce a restriction that prevents users from disabling it on managed Macs." Option A ensures caching is active. Option B has a typo ("IoadCache" should be "loadCache") and isn't standard, C aids discovery but not reduction, and D increases traffic.
Reference:
macOS Deployment Reference, "Content Caching" section.
Apple Platform Deployment Guide, "Network Optimization" section.