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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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出自：Oracle认证

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