Final answer:
CASE tools aid in software development and maintenance, but they are not always inexpensive or user-friendly.
Step-by-step explanation:
CASE tools, or Computer-Aided Software Engineering tools, aid in the development and maintenance of software systems. They provide various functionalities such as modeling, code generation, project management, and documentation.
The statement 'CASE tools are always inexpensive' is not true. The cost of CASE tools can vary depending on the complexity and features they offer.
Details of the products are typically stored in the CASE tool itself. This allows developers to store and access information about the software they are building, such as requirements, design models, and test cases.
However, the statement 'CASE tools are not always user-friendly' is true. Some CASE tools can have a steep learning curve or may lack intuitive interfaces, making them less user-friendly.
Therefore, the correct answer is option 3: CASE tools are not always user-friendly.