In SAP systems, the transport management system (TMS) facilitates the migration of development objects from one SAP system to another. Within TMS, there are different transport strategies, including 'Queue-Driven Transports. Mass transports' and 'Queue-Driven Transports. Single transports'. The features unique to 'Queue-Driven Transports. Mass transports' include:

B) Using the 'Import Request' function causes the imported transport requests to remain in the import queue: This feature is significant for mass transports as it allows multiple transport requests to be processed in a batch. This means that after a transport request is imported, it stays in the queue, enabling the subsequent requests to be processed in a streamlined manner without manual intervention for each request.

C) Return Code 8 is considered a successful import: In mass transport scenarios, a return code of 8, which typically indicates warnings, is treated as a successful import. This approach allows the mass import process to continue despite minor issues that do not critically impact the import's success.

D) The 'Import All Requests' function is available: This function enables the import of all queued transport requests in one operation, which is particularly useful in mass transport scenarios where numerous transports need to be imported efficiently and effectively. This feature streamlines the import process, reducing the time and effort required to manage individual transport requests.

These features are designed to support the efficient handling of multiple transport requests, enhancing the flexibility and effectiveness of the transport management process in complex SAP landscapes.