Which of the following statements is true regarding the initialization parameter DIAGNOSTIC_DEST?
A. The default value is the value of the environment variable $ORACLE_HOME; if $ORACLE_HOME isn’t set, then the default is set to $ORACLE_BASE.
B. The default value is the value of the environment variable $ORACLE_BASE; if $ORACLE_BASE isn’t set, 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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