Which elements are involved in completing a tracking history in stationary radar?

The correct choice involves elements that are fundamental to gathering and maintaining an accurate tracking history while using stationary radar. Visual estimation, audio Doppler, and target speed display work together to provide a comprehensive understanding of the target's movement.

Visual estimation allows the operator to interpret the visual information presented by the radar system, which helps in gauging the speed and direction of the target. Audio Doppler provides auditory feedback that confirms the speed of the target based on the change in frequency of the radar signal as it reflects off the moving vehicle. This auditory confirmation is critical for validating the visual estimation, ensuring that the operator is correctly identifying the target speed.

The target speed display consolidates data from both visual observations and audio feedback, presenting a clear and accurate speed reading to the operator. This combination of elements ensures a reliable tracking history, allowing law enforcement personnel to make informed decisions based on precise data.

In contrast, the other combinations of elements listed do not comprehensively address the requirements for creating a robust tracking history, as they may include unrelated or less relevant components that do not contribute effectively to the tracking process.