To ensure that records are categorized correctly, which feature can be used for custom fields?

The correct choice for ensuring that records are categorized correctly through custom fields is the feature of Field Dependency. Field dependency allows you to create a relationship between two fields, where the available options in one field depend on the value selected in another field. This means that when a user selects a value in the controlling field, the dependent field dynamically updates to show only the relevant choices.

This feature is particularly valuable in scenarios where categorization is complex or needs to be context-sensitive. For example, if you are categorizing customer records, the options in the 'City' field could change based on what 'State' is selected, ensuring that users can only select valid combinations. This guided input not only helps streamline data entry but also minimizes errors and ensures consistency in how records are categorized.

While field type defines the nature of the data that can be held in a field, and field label specifies how the field is presented to users, these features do not provide the same level of dynamic categorization as field dependency. Field security relates to who can view or edit the fields but does not impact how the fields interact with each other to enhance data accuracy.