Both OmniScript and Card Layouts (now known as FlexCards) that display a list of items require the input data to be a JSON array. Each element within the array should be a JSON object that represents a single item (e.g., a single card or a row in a repeating block). Option D provides a root-level JSON array [ { ... } ], which is the standard and most direct data structure for these components. This format allows the component to iterate through the elements and display them accordingly. Options A and B are single objects, not arrays, and are therefore incompatible with list-based components.

A: This is a nested JSON object, not an array. Card Layouts require an array to iterate over for creating multiple cards.

B: This is a single JSON object. It cannot be used to populate a list or a series of cards, as it is not an array.

C: This is a JSON object containing a named array. While a Card Layout can be configured to use a nested array, the root-level array (Option D) is the more direct and standard format.

1. Salesforce Help

OmniStudio Documentation

FlexCard Data Source Properties: "The data source for a FlexCard must be in the form of an array of records

such as the data returned from a SOQL query or a DataRaptor that extracts a list of records." This confirms the requirement for an array structure.

2. Salesforce Help

OmniStudio Documentation

DataRaptors

DataRaptor Transform Action JSON for an Array: The documentation provides examples showing that to create a list of items

the output JSON from a DataRaptor Transform should be structured as a JSON array

[{"key":"value"}]

which matches Option D.

3. Trailhead

OmniStudio FlexCards

Build a Basic FlexCard: In the "Create a DataRaptor to Get Weather Data" unit

the test response for the DataRaptor Extract is shown as a root-level array of account objects

reinforcing that this is the expected format for a FlexCard data source.