What are the Data Table options you can designate through the GAC?

The correct choice highlights the flexibility offered by the Global Application Configuration (GAC) in ServiceNow. When using the GAC, you can not only select an existing table but also create a custom table. This option is particularly powerful because it allows developers to extend the functionality of existing tables by building on top of them, thereby enabling the customization of data structures to meet specific business needs.

By selecting an existing table, you can adopt its schema and behaviors, which can significantly speed up the development process since it allows you to leverage existing fields and relationships. Creating a custom table alongside this means you can introduce new fields or modify certain aspects to adapt to unique requirements without starting from scratch.

The other options do not encompass this combination. Selecting only an existing table without creating a new one would limit the customization capabilities. Simply creating a custom table without considering existing ones may lead to redundancy and missed opportunities to enhance the existing data structures. Thus, the combination of both selecting an existing table and creating a custom table provides the optimal path for effective application development in ServiceNow.