Explanation The integration architect should recommend using Salesforce Connect to display the financial transactions as an external object. Salesforce Connect is a feature that allows you to integrate external data sources with Salesforce and access them in real time via external objects. External objects are similar to custom objects, but they store metadata only and not data. You can use external objects to display data from the core banking system in the customer community without copying or syncing the data. You can also use standard Salesforce features, such as reports, dashboards, or global search, with external objects. Salesforce External Service is a feature that allows you to import an external schema definition and generate an Apex wrapper class that can invoke an external service. This is useful for integrating complex business processes or workflows with Salesforce, but not for displaying data in a community lightning page. Iframe is a HTML element that allows you to embed another web page within a web page. This is not a recommended solution for displaying data in a customer community, as it can pose security risks, performance issues, or user interface problems. References: [Salesforce Connect], [Salesforce External Services], [Using Iframes in Lightning Components]
