Which statements are true regarding the Bulk API and SOAP API for a data migration into Salesforce?

The correct answer is that the Bulk API allows multiple attachments to be loaded from within a single ZIP file. This is accurate because the Bulk API is designed to handle large volumes of data and enable efficient data loading to Salesforce. When working with the Bulk API, users can package multiple files, including attachments, into a single ZIP file to streamline the upload process. This feature significantly enhances the efficiency of data migration scenarios by reducing the number of separate API calls needed to upload multiple records and their associated files.

In contrast, the other statements do not accurately reflect the capabilities or characteristics of the Bulk API and SOAP API. For example, the statement about DML limits suggests that the Bulk API operates independently of Salesforce's server limits, which is not true; DML operations still adhere to Salesforce's governance limits. Similarly, while the SOAP API provides a way to interact with Salesforce data, it does not feature job monitoring through the Salesforce setup menu as described. Lastly, the SOAP API does not specifically address the issue of record locking contention in master-detail relationships as suggested; record locking is a consideration for all APIs, not uniquely managed by the SOAP API.