【单选题】
A <{p}>SELECT * FROM teachers WHERE salary<= (SELECT MAX(salary) FROM teachers)<{/p}>
B <{p}>SELECT * FROM teachers WHERE salary >=(SELECT MIN(salary) FROM teachers)<{/p}>
C <{p}>SELECT * FROM teachers WHERE salary>= (SELECT AVG(salary) FROM teachers)<{/p}>
D <{p}>SELECT * FROM teachers WHERE salary<= (SELECT AVG(salary) FROM teachers)<{/p}>
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