Which of the following describes the Bottom Up approach in detail?

The Bottom Up approach in development is characterized by starting with the foundational elements of a system before moving to higher-level abstractions. In this context, selecting the option that states "Create database tables first, then generate CDTs" accurately represents this methodology, as it emphasizes the importance of first establishing the core data structure by creating the underlying database tables.

Once the tables are set, Custom Data Types (CDTs) can be generated to provide a more abstracted and user-friendly interaction with the data stored in those tables. This approach is useful in scenarios where the data model is well understood and the focus is on ensuring that the database schema supports the necessary data relationships and structures.

By focusing on the creation of database tables as the initial step, this method ensures that all subsequent development can rely on a solid and tested data foundation, which can lead to more successful integration and use within applications.

While other options may touch upon aspects of development, they do not align with the core philosophy of the Bottom Up approach, which emphasizes starting from the data structure and building upwards.