When the query optimization process is complete, what is selected to run the query What is the ability of a database to allow multiple users to affect multiple transactions What is a part of a DBMS that determines the best execution of SQL queries

Question: When the query optimization process is complete, what is selected to run the query? What is the ability of a database to allow multiple users

When the query optimization process is complete, what is selected to run the query?
What is the ability of a database to allow multiple users to affect multiple transactions ?
What is a part of a DBMS that determines the best execution of SQL queries?

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