What does the possible_keys column in this output denote?

A. if it is possible for you to include any indexes in your query
B. whether there are any indexes on the tables that you are querying
C. if there are any indexes that may be used to solve this query
D. whether there are any indexes in your query
Answer: C

A. 在Query中可能包含的索引信息
B. 查询的表上包含了一些索引
C. Query中可以使用的索引
D. 在Query中包含的索引信息

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MYSQL