What statement is correct regarding the maintenance requirements for A3 ships under GMDSS?

If the vessel selects at-sea maintenance no additional parts and spares are required.

On-board maintenance provided by a person holding a GMDSS Maintainer's license will fully meet the requirements.

Redundancy of functions of certain equipment and on-board maintenance provided by a person holding a GMDSS Maintainer's license will partially meet this requirement.

Shoreside maintenance and scheduled tests and inspections will not partially meet this requirement.

What statement is correct regarding the...