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Which of the following statements is true regarding the initialization parameter DIAGNOSTIC_DEST？（）   The default value is the value of the environment variable $ORACLE_HOME； if $ORACLE_HOME isn’t set  
A: then the default is set to $ORACLE_BASE  The default value is the value of the environment variable $ORACLE_BASE； if $ORACLE_BASE isn’t set，
B: then it is set to $ORACLE_HOME
C: DIAGNOSTIC_DEST is always equal to $ORACLE_HOME
D: DIAGNOSTIC_DEST is always equal to $ORACLE_BASE

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出自：Oracle认证

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