The correct answer is External Objects. External objects are similar to custom objects, except that they map to data that’s stored outside your Salesforce org12. You can use external objects toaccess data in real time via web service callouts, without copying the data into your org12. External objects are read-only by default, but you can enable write operations forsome data sources12.
Big Objectsare not the correct answer. Big objects allow you to store and manage massive amounts of data on the Salesforce platform. However, big objects are not suitable for referencing historical data in another system, as they require importing the data into the org and incur storage costs.
Lightning Out is not the correct answer. Lightning Out is a feature that lets you run Lightning components in any container outside the Salesforce platform. However, Lightning Out does not provide a way to reference historical data in another system, as it is mainly used for embedding Lightning components in other web pages or apps.
External SOQL queries in Apex code are not the correct answer. External SOQL queries are a way to query data from external data sources using SOQL syntax in Apex code. However, external SOQL queries require defining an external data source and an external object first, so they are not a product feature by themselves, but rather a way to use external objects in Apex code. References:
B2B Commerce on Lightning Experience Developer Guide
B2B Commerce and D2C Commerce Developer Guide
Salesforce Accredited B2B Commerce Developer
Work with External Data Sources
Access External Data WithSalesforce Connect
Migrate data from one organization to another
Monitor Login History
[Big Objects]
[Lightning Out]
[External SOQL Queries]
