Which three statements are true about the logging or tracing of Java-based Oracle tools?

Which three statements are true about the logging or tracing of Java-based Oracle tools?

A.
By default, Oracle logs actions for DBCA and DBUA

B.
For tools such as SRVCTL and CLUVFY, tracing can be enabled by setting srvm trace =
true your shell environment before executing the commands.

C.
The srvm_trace environment variable can be set only in the user’s shell environment file.

D.
To disable tracing for Java-based tools, unset the srvmtrace variable:export srvm_trace=