Categories of SQL Commands: DML, TCL, DDL

The correct answer is 'B. All of them'.

SQL commands are categorized into three main groups:

• Data Manipulation Language (DML): Used for manipulating data within tables, including inserting, updating, and deleting records. Examples include INSERT, UPDATE, and DELETE.
• Transaction Control Language (TCL): Used to manage transactions within a database, ensuring data consistency and integrity. Examples include COMMIT, ROLLBACK, and SAVEPOINT.
• Data Definition Language (DDL): Used to define the structure of the database, including creating, altering, and dropping tables, indexes, and views. Examples include CREATE, ALTER, and DROP.