Which isare part of MySQL SubsystemAAll of themBDDL CompilerCExecution EngineDQuery PreprocessorSakila

A. All of them.

The MySQL Subsystem includes several components, including the DDL Compiler, Execution Engine, Query Preprocessor, and more. All of these components work together to allow for the creation, management, and querying of databases using MySQL. The Sakila database is a sample database that can be used with MySQL to practice querying and other database tasks.