E: Oracle Restart runs periodic check operations to monitor the health of these components. If a check operation fails for a component, the component is shut down and restarted.
Not D: Individual components can be restarted manually using SRVCTL. Oracle restart is used for starting/stopping components in an orderly fashion. So, randomly stopping/starting any individual component has to be done manually (advised to use SRVCTL for that).
A is definitely true: "When you install Oracle Restart, various Oracle components can be automatically restarted after a hardware or software failure or whenever your database host computer restarts"
https://docs.oracle.com/cd/E18283_01/server.112/e17120/restart001.htm#CIHGAEHA
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