【单选题】
Oracle9i extends the cursor sharing functionality with the new value of SIMILAR for the CURSOR_SHARING parameter. With CURSOR_SHARING = SIMILAR， cursors are shared for safe literals only. What is meant by ‘safe literals only’？（） 
A、No literal value is substituted for a shared cursor.
B、Different execution plans are generated for substituted literal values.
C、The substitution of a literal value will produce different execution plans.
D、The substitution of any literal value will produce exactly the same execution plan.
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