单选题

现有t1表存在索引：idx_a_b_c（a, b, c）下面那些SQL会被索引？

Question

A. SELECT * FROM t1 WHERE a!=1

B. SELECT * FROM t1 WHERE b=1 AND a=4

C. SELECT * FROM t1 WHERE b=2 OR c=3

D. SELECT * FROM t1 WHERE a=1 AND b=2 AND c=3