What are stating modes are available in Weblogic Server ?

Answer:
There are three starting modes are available:
1) Stage mode:
Administration Server copies the deployment files from their original location on the Administration Server machine to the staging directories of each target server
2) External Stage:
Target servers deploy using local copies of the deployment files, here the Administration Server does not automatically copy the deployment files to targeted servers in external_stage mode. Instead, you must copy the files to the staging directory of each target server before deployment.
3)No Stage:
The Administration Server does not copy deployment unit files. instead, all servers deploy using the same physical copy of the deployment files, which must be directly accessible by the Administration Server and target servers.