Prior to transmitting surveillance tracks, which of the following must units do?

The correct response emphasizes the importance of monitoring and adjusting data registration before transmitting surveillance tracks. Data registration ensures that the information from various sources is accurately aligned and properly interpreted. This step is critical for maintaining situational awareness and ensuring effective communication between units. When data registration is properly monitored and adjusted, it helps minimize discrepancies in the data, allowing for more reliable and timely decision-making regarding joint operations.

In scenarios where surveillance tracks are involved, ensuring that the data is accurately registered prevents potential misunderstandings or operational errors. Without proper data registration, units may misinterpret the information being shared, which could lead to misguided actions or increased risk on the battlefield.

The other options might pertain to various operational protocols, but they do not adequately address the critical preparatory step of data registration necessary before the effective transmission of surveillance tracks.