Which of the following best describes the Data Queue’s contents?

The Data Queue's contents are best described as metadata and message timestamps because it serves as a mechanism for tracking the state and timing of messages as they are processed within the system. Metadata provides additional context about the data items, including information on their origin, format, and the parameters used during processing, while timestamps indicate when a particular message was added to the queue or when it was processed. This combination is crucial for ensuring that messages can be efficiently managed, tracked, and audited throughout their lifecycle.

In contrast, raw data entries would refer to unprocessed data that has not yet been contextualized within the system, while a summary of completed messages would imply a state that only reflects processed data without the rich context provided by metadata. Potential errors in message processing would be specific instances of problems that may have occurred, which is not a description of what is continuously held within the Data Queue; rather, these would be handled through error logging or other monitoring systems. Thus, option B accurately captures the essential nature of what is contained in the Data Queue.