Ananya is creating a table in Base to store the details of all the students in class ‘9A’. She wants to create the field ‘Rollnumber’ as a primary key. She knows that there are maximum 40-50 students in that class. Which of the following data type is most suitable for this primary key?

A relational database management system (RDBMS) is a program used to create, update, and manage relational databases. Some of the most well-known RDBMSs include MySQL, PostgreSQL, MariaDB, Microsoft SQL Server, and Oracle Database.