A nonprofit needs to load approximately 3 million records into Salesforce.

For loading a large volume of records, such as approximately 3 million records, into Salesforce, the Bulk API is the most efficient method. The Bulk API is designed to handle large data sets by processing records asynchronously in batches, which reduces the load on Salesforce servers and ensures efficient data transfer. This API is optimized for data loading and extraction, making it ideal for high-volume data operations.