What field type would you select if you want to query records from another table on a form?

In ServiceNow, a Reference field establishes a relationship to another table by storing the sysid of a record in that table and displaying its display value. When added to a form, the field automatically produces a slush-bucket or auto-complete lookup so users can query and select records from the referenced table. No other field type enables live querying of another table in this manner; Phone Number, String, and Date merely capture literal values, not foreign-key links.

B. Phone Number fields hold formatted telephone data; they do not point to external tables.
C. String fields store free-text; they lack foreign-key functionality to query other tables.
D. Date fields capture date/time values only; they cannot reference or retrieve external records.

1. ServiceNow Product Documentation - “System Dictionary: Field Types – Reference,” Quebec release, docs.servicenow.com → Platform > Foundation Data > Tables and Columns > Reference fields (para. 1-3).

2. ServiceNow Developer Site – “Create a Reference field,” Module: Data Model - Tables, Section “How Reference fields work” (steps 1-2, example walkthrough).