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For a Virtual Instrument (VI) to be reentrant while utilizing a Functional Global Variable, it is essential to configure the Execution Settings properly. Reentrancy allows multiple instances of the VI to execute simultaneously, which is critical when dealing with functional global variables that can store data that needs to be accessed in a thread-safe manner.

By configuring the Execution Settings to make the VI reentrant, each instance of the VI maintains its own copy of the data from the Functional Global Variable. This ensures that concurrent executions do not interfere with each other, allowing the data to be accessed and modified by different instances without causing conflicts or data corruption.

This setup is crucial when developing applications that require parallel processing or when the same VI might be called by multiple loops or events at the same time. The other options, while important in different contexts, do not directly address the requirement for reentrancy in relation to Functional Global Variables.