Which of the following is not a RDBMS?Select one:a.DB Sysb.MariaDBc.MS Accessd.MS SQL Servere.Oracle

To determine which of the provided options is not a Relational Database Management System (RDBMS), we can analyze each option:

1. DB Sy: This option is unclear, but it might refer to "DB2," which is an RDBMS developed by IBM. If it is a typo and actually refers to a relational database, it would be considered an RDBMS.

2. MariaDB: This is an open-source RDBMS that is very similar to MySQL. It is designed for compatibility with MySQL and is indeed an RDBMS.

3. MS Access: Microsoft Access is a desktop database system that can use relational database features but is often not categorized strictly as an RDBMS because it is not primarily designed for server environments or large-scale applications.

4. MS SQL Server: This is a relational database management system developed by Microsoft designed for enterprise environments.

5. Oracle: Oracle Database is a well-known RDBMS widely used in enterprises and supports many advanced database features.

Final Answer

Based on the analysis, a. DB Sy (assuming it is not a recognized RDBMS) is not clearly identifiable as an RDBMS due to the ambiguity of the name; however, if we consider all options as they are, MS Access is the least traditional RDBMS compared to the others listed and might be the intended answer depending on the context of the question.