What is required for certain workbook functionalities such as viewing details of records?

The correct answer highlights the significance of underlying links in facilitating certain workbook functionalities, particularly when it comes to viewing details of records. Underlying links are crucial because they connect different data sets or elements within a workbook, allowing users to access detailed information that may not be immediately visible.

These links create a relational structure that enables the workbook to pull in additional data or to navigate between related records smoothly. As a result, when a user wants to view more details about a specific record, it is the underlying links that provide the pathway to those details, integrating various data points seamlessly for a coherent overview.

In contrast, manual input by users is not a necessary requirement for viewing record details, as that function relies on the pre-existing relationships established by the links, rather than additional inputs. Similarly, special software installations and extended data plans are not relevant to the core functionality of a workbook regarding the viewing of record details, as they relate more to the software environment or data access limitations rather than the inherent capabilities of the workbook features.