Final answer:
The question relates to Computers and Technology and seems to refer to concurrency or resource utilization in scheduling. Without the specific context of FR3 and VR4, a definitive answer cannot be provided.
Step-by-step explanation:
The question "The thinner of two schedules, FR3 and VR4 is ___" seems to pertain to a topic within Computers and Technology, possibly related to network scheduling, algorithms, or a specific system's naming conventions. The thinness of a schedule likely refers to the level of concurrency or resource utilization in a given process schedule, where a "thinner" schedule would have less overlap or fewer tasks running concurrently. Without specific context, it is difficult to provide a definitive answer, and it would be wise to refer to the documentation or specifications related to these schedules.