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【单选题】
设有学生关系:S(SNO, SNAME, SEX, AGE, DEPT)。在这个关系中,SNO表示学号,SNAME表示姓名,SEX表示性别,AGE表示年龄,DEPT表示系部。查询学生姓名和所在系的投影操作的关系运算式是 ?
A.
П2, 4（S）
B.
σ2, 4（S）
C.
ПSNAME, DEPT（S）
D.
σSNAME, DEPT（S）
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