Refer to the exhibit.

The exhibit shows the output of show vsx status on sw-agg1. Key information includes:

Config Sync Status : sw_image_version_mismatch_error  

NAE : sw_image_version_mismatch_error  

HTTPS Server : sw_image_version_mismatch_error  

Primary Software Version: GL.10.09.0010  

Secondary Software Version: GL.10.11.1021  

These errors clearly indicate that the primary and secondary VSX switches are running different AOS-CX software versions. For VSX to operate correctly, including configuration synchronization and enabling features like MC-LAG interfaces, both switches in the pairmustrun the exact same software version.

Analysis of Options:

A: vsx-software-upgrade is used for upgrades but doesn't resolve the current mismatch requirement.

B: NAE errors are a symptom of the underlying version mismatch.

C: Using the same CX OS version on both primary and secondary switches is the fundamental requirement to clear the mismatch errors and achieve a stable VSX operational state.

D: While ServiceOS is part of the system, the primary requirement and error message relate to the main AOS-CX software version.