Node Manager is used for
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a. Killing Managed Server
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b. Auto restarting failed servers
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c. Remotely start and stop Managed Servers
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d. All of above
Node Manager is a WebLogic utility used for remote server management. It can remotely start and stop Managed Servers, auto-restart failed servers, and can be used to kill/terminate Managed Servers. Therefore, all the listed functions are valid uses of Node Manager.
WebLogic's Node Manager is a utility that provides several server lifecycle management capabilities: it can remotely start and stop Managed Servers, automatically restart servers that fail unexpectedly (health monitoring), and it can also be used to kill (forcibly stop) a Managed Server. Since it performs all of these functions rather than just one, 'All of above' is the most complete and correct answer — each individual capability listed (killing, auto-restart, remote start/stop) is a real, documented Node Manager function.