What are the three basic operations used in a relational database to develop useful sets of data?

The correct answer is rooted in understanding the fundamental operations of relational databases. The three basic operations that are commonly recognized for manipulating and retrieving data in a relational database are "select," "project," and "join."

1. Select: This operation is used to retrieve records from one or more tables based on specific criteria. It allows users to filter data so that only the desired information is returned. For example, if you want to extract records of employees from a particular department, the select operation helps achieve that.

2. Project: This operation is concerned with specifying which columns or attributes from the records should be included in the results. For instance, if a database contains a table with employee information, and you're only interested in the names and email addresses, the project operation allows you to retrieve only those specific columns.

3. Join: The join operation is used to combine records from two or more tables based on related columns between them. This is essential for retrieving data that is spread across different tables. For example, joining an employees table with a departments table based on a department ID allows access to complete employee records along with their department details.

The other choices may involve some of these operations but either incorrectly include terms that are not standard