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 srvm_trace variable: export srvm_trace=

Explanation:
Enabling Tracing for Java-Based Tools and Utilities in Oracle RAC
All Java-based tools and utilities that are available in Oracle RAC are called by executing scripts of
the same name as the tool or utility. This includes the Cluster Verification Utility (CVU), Database
Configuration Assistant (DBCA), the Net Configuration Assistant (NETCA), Server Control Utility
(SRVCTL), and the Global Services Daemon (GSD). For example to run DBCA, enter the
command dbca. By default, Oracle Database enables traces for DBCA and the Database Upgrade
Assistant (DBUA). For the CVU, GSDCTL, and SRVCTL, you can set the SRVM_TRACE
environment variable to TRUE to make Oracle Database generate traces. Oracle Database writes
traces to log files. For example, Oracle Database writes traces to log files in Oracle
home/cfgtoollogs/dbca and Oracle home/cfgtoollogs/dbua for DBCA and DBUA, respectively.
Oracle Real Application Clusters Administration and Deployment Guide