What Mapping update should be used to add information about survey participants to the Contact object in Salesforce?

The correct choice involves using the "Insert" mapping update when adding information about survey participants to the Contact object in Salesforce. The Insert function is specifically designed for adding new records into a database or system, which is essential when you're working with survey participants who may not already exist as contacts in Salesforce.

In the context of integrating survey data, using the Insert function allows for the creation of new contact entries based on the responses collected from participants. This process ensures that each participant’s data is captured as a distinct record, allowing organizations to maintain accurate and updated contact information for follow-up actions, further engagement, or analysis.

Using other mapping updates such as Update, Delete, or Merge would not be appropriate in this scenario. 'Update' is used when modifying existing records, 'Delete' removes records from the system, and 'Merge' consolidates duplicate records. Since the focus here is on adding new participant details rather than altering or removing existing entries, the Insert option is the clear and correct choice for this task in Salesforce.