Correct Answer: A, CTo apply updates without causing a host reboot, focus on those components that do not require a system restart. Updating data drives involves changes that typically do not necessitate a host reboot, as they are usually designed to handle updates or replacements transparently. The AOS (Acropolis Operating System) updates also avoid host reboots; their updates typically require a rolling CVM (Controller VM) reboot, not a host reboot. Conversely, changes to M.2 drives, which often serve as boot drives, and updates to AHV (Acropolis Hypervisor) typically require reboots to take effect. Therefore, updating Data Drives and AOS are the correct choices for avoiding host reboots.