What is one of the uses of the OPTASK LINK message after network operations have been established?

The correct answer highlights the role of the OPTASK LINK message in ensuring the smooth operation of the Link-16 network post-establishment. Once network operations are in place, maintaining link operations is crucial for effective data sharing and communication among participating units. This message serves as a tool to convey operational objectives, updates, and requirements necessary to sustain the integrity and functionality of the network.

Maintaining link operations involves ensuring that all systems are synchronized, addressing any issues that may arise, and confirming that link support functions are effectively executing their intended tasks. Thus, the OPTASK LINK message is integral for achieving and preserving the operational readiness of the network.

The other choices focus on aspects that, while relevant in different contexts, do not encapsulate the primary purpose of the OPTASK LINK message after network setup. Resolving problems might occur but is a more reactive measure rather than a proactive maintenance function. Changing configurations and coordinating modifications imply an adjustment of the network setup, which may not necessarily be the immediate concern once operations are already established. The emphasis of the OPTASK LINK is more about maintaining effective link operations rather than making alterations or addressing issues post-factum.