Reference Field Type:
The Reference field type is used to create a relationship between two tables. It allows you to select
and display records from another table directly on a form.
For example, adding a "Caller" field to an Incident form enables you to query and select records from
the sys_user table.
Why Other Options Are Incorrect:
Option B (Phone Number field type): This is used for storing phone numbers, not for querying
records from another table.
Option C (String field type): While this stores plain text, it does not allow querying or establishing
relationships with other tables.
Option D (Date field type): This is used for date or time values, not for referencing another table.
Reference:
ServiceNow Developer Documentation on Field Types .
