Q: What is a query optimizer in a DBMS?

A A tool for database design and modeling
B A component for producing graphs and charts
C A mechanism for monitoring database performance
D A module that chooses an efficient query execution plan

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Answer: D

Explanation:

A query optimizer is a component in a DBMS that is responsible for selecting the most efficient query execution plan for a given query.
It analyzes the query and available data statistics to determine the optimal way to retrieve the requested data.
The goal is to minimize resource usage, such as CPU and disk I/O, and improve query performance.

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