Which describes the function of Safe Boot in OS X?
A. To facilitate troubleshooting by preventing loading of third-party components in the operating system at startup
B. To prevent users from accessing sensitive system files by loading Simple Finder instead of Finder at startup
C. To increase data security by assigning all standard users Read-only privileges to mounted local volumes
D. To increase data security by modifying Sharing settings, so only essential protocols are enabled at startup