Which of the following is the most popular query language used by major…

Concept: A database's query language is the formal language used to define, manipulate, and retrieve data, and different database models use different standardized languages. For the relational model — where data is organized into rows and columns across related tables — one language has been adopted as the industry and ANSI/ISO standard across virtually every major RDBMS.

Application: Structured Query Language (SQL) is that industry-standard language: MySQL, PostgreSQL, Oracle, SQL Server, and other major relational database systems all implement SQL (through its DDL, DML, DCL, and TCL command categories) as the primary means of interacting with data, making it the most widely used query language for RDBMS.

Cross-check: None of the remaining options name a complete, standardized RDBMS query language:

• Data Manipulation Language (DML) is only one command category within SQL — used for inserting, updating, deleting, and selecting data — not a complete, independent query language of its own.

• Query Language (QL) is a generic descriptive term for any data-querying language; it is not the specific, standardized name adopted by relational database systems.

• Object Query Language (OQL) is built for querying object collections in object-oriented databases, not for the row-and-column relational model.