Which aspect of Link 16 relies on time slots for efficient data exchange?

The aspect of Link 16 that relies on time slots for efficient data exchange is Time Division Multiple Access (TDMA). TDMA is a method used in communications where multiple users can share the same frequency channel by dividing the signal into several time slots. Each user is assigned a specific time slot during which they can transmit their data. This structure not only allows for efficient use of the available bandwidth but also minimizes potential interference between different users, as data transmission occurs at distinct intervals.

In the context of Link 16, TDMA is crucial because it supports real-time data exchange among various military platforms by ensuring that data packets are sent and received without overlap. This approach enhances the reliability and effectiveness of the communication network, enabling a synchronized exchange of tactical information across different units.

The other options, while related to aspects of communication systems, do not specifically focus on the structured use of time slots to facilitate data transmission. Data integrity refers to the accuracy and completeness of data rather than its timing. Network security pertains to protecting information from unauthorized access, and data redundancy relates to the duplication of data to prevent loss rather than the timing of its transmission. Thus, TDMA stands out as the correct answer for its fundamental role in managing data exchange through predetermined time slots.