Salesforce Exam OmniStudio Consultant Topic 2 Question 8 Discussion

A business wants to add typeahead functionality to an existing OmniScript. The business wants the user to begin entering the name of a contact in Salesforce. and allow the user to select the contact once it has found a match. Once the contact has been selected, the OmniScript should retrieve the contact's email address for use in a later step of the process.

What data source is needed when using the TypeAhead element?