An OmniStudio Developer at Coral Cloud Resorts has built a complex FlexCard that displays reservation...

The correct tool is the Test Data and Parameters panel in the FlexCard Designer. The requirement is specifically to test the FlexCard directly in its designer with different JSON inputs before deployment. The OmniScript Test Console is for OmniScript logic, not FlexCard data rendering. IDX Workbench is a migration/deployment tool, not the FlexCard’s built-in data-testing panel. A Data Mapper Turbo Extract preview only tests the Data Mapper query output; it does not validate how the FlexCard processes different JSON structures and renders states, fields, or conditional elements. Salesforce documentation for FlexCard testing describes adding test parameters in the FlexCard Designer and previewing/debugging the card using those values, which directly supports option C.

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