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On both sides at the bow. There is a lettering height and size requirement, information which would be available from the US Coast Guard.
On the list of choices posted with the question, there is nothing that could be placed between two odd numbers.
It is a space.
You must add either two odd numbers or two even numbers.
Even numbers must have 2 amongst their factors; they may have other even numbers amongst their factors. Odd numbers must not; every factor of an odd number must be odd.