多选题

What two statements are true about Oracle Enterprise Manager’s Java Diagnostic tool, which makes the tool suitable for production server diagnostics ?()

A virtually zero overhead for application running in the JVM 

B no stalling of running JVM when taking a heap dump for memory analysis 

C no need of modification, changes, or instrumentation of the application since is uses Network Protocol Analysis (NPA technology)

D provides Byte Code Instrumentation for Java

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