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The correct answer is a logic analyzer because it is specifically designed to capture and analyze multiple digital signals simultaneously. A logic analyzer can display these signals in a format that allows for easy comparison to expected timing diagrams, enabling users to observe the relationships between different signals over time. This capability is essential for digital system testing, troubleshooting, and validating that a circuit operates as intended.

A signal generator is primarily used to create electrical signals, whereas a multimeter is designed for measuring voltage, current, and resistance in circuits, rather than analyzing multiple signals. An oscilloscope can also display waveforms and show timing relationships, but it typically focuses on analog signals and provides less functionality for digital signal comparison than a logic analyzer. Thus, while all the other devices serve important roles in electronics, the logic analyzer stands out for its specific application in displaying and comparing digital signals against expected behaviors.