________ is used to determine whether a query is a covered query.(1 Point)explainstats()explainall()All of the aboveexplain()

The correct option is explain().

In SQL and database management, the EXPLAIN statement is used to obtain information about how a query will be executed by the database engine. It provides insights into the execution plan, including whether a query can utilize indexes to enhance performance. Specifically for determining if a query is a covered query, EXPLAIN will indicate if all the columns required by the query are available in the index, thereby confirming whether the index can cover the query and eliminate the need to access the actual table.

Choosing EXPLAIN gives developers and database administrators the ability to analyze and optimize queries, ensuring efficient performance. The other options, such as explainstats() and explainall(), may be part of specific implementations or extensions but are not standard SQL commands related to determining covered queries.