Until the current transaction is processed, no other ____________ can be submitted.

The correct answer is focused on the specific context of transactions. The phrase highlights an important operational principle in systems handling multiple requests or actions: until the current transaction is fully processed, new access requests cannot be made.

Using "Access Requests" emphasizes the nature of the current transaction, suggesting a scenario where specific permissions or processes are pending completion. This term is often used in IT and database management, where access to resources or systems is restricted while a transaction is in progress to ensure data integrity and security.

In contrast, the other terms are broader and may not convey the same precise meaning as "Access Requests." "Requests" could encompass a wide range of inquiries or submissions that might not be directly related to the current transaction. "Transactions" could imply any general action taken within the system, but does not specifically denote requests for access, which is crucial in this context. "Items" is too vague and does not encapsulate the procedural nuances of managing system access during an active transaction.

Therefore, "Access Requests" is the most accurate term that reflects the operational limitations placed on system interactions while a current transaction is being processed.