单选题Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1 and C2 together, which statement(s) will create index(es) that will provide optimal query performance? （）A CREATE UNIQUE INDEX xtab1 ON tab1 (c1) include (c2)B CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c3) INCLUDE (c2) C CREATE UNIQUE INDEX xtab1 ON tab1 (c2, c1)D CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1）
单选题
Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1 and C2 together, which statement(s) will create index(es) that will provide optimal query performance? （）
A
CREATE UNIQUE INDEX xtab1 ON tab1 (c1) include (c2)
B
CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c3) INCLUDE (c2)
C
CREATE UNIQUE INDEX xtab1 ON tab1 (c2, c1)
D
CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1）
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