单项选择题

Which /SQL*Plus feature can be used to replace values in the WHERE clause?（）

A. Substitution variables
B. Replacement variables
C. Prompt variables
D. Instead-of variables
E. This feature cannot be implemented through /SQL*Plus

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Examine the description of the MARKS table:

SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.
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A. The SQL statement displays the desired results.
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