28. Within a single sea area, what is the primary reason GMDSS imposes carriage requirements for different radio subsystems?

Redundancy in duplicating all operational functions in the event of a system failure.
Different subsystems are required to meet the specific equipment carriage requirements of national authorities.
GMDSS vessels must be equipped to communicate in all modes with coast radio stations.
The combined capabilities of redundant subsystems mitigate the risk of a single point of failure.

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