Final answer:
ADO focuses on providing tools for applications to access and manipulate data in relational databases, using components designed for the Microsoft COM model.
The Correct option is ; c. Relational database.
Step-by-step explanation:
ADO, which stands for ActiveX Data Objects, is a set of components in Microsoft's COM model that enables software applications to access data from relational databases. It does not specifically focus on XML databases, text and binary file systems, or key-value pair databases.
Instead, ADO is commonly used for managing database access in languages like Visual Basic and C# when working with relational database systems, such as Microsoft SQL Server or Access.
ADO acts as a middleware between the application and the database, allowing developers to write code that can access the data without needing to know the underlying database implementation details.