What does a lower multiplicity of one for an end of an n-ary Association imply?

What does a lower multiplicity of one for an end of an n-ary Association imply?
A . Links combining the values of the other ends may exist or may not exist
B . Exactly one link exists combining the values of the other ends.
C . A link for every possible combination of values for the other ends must exist.
D . Links combining the values of one or many other ends may exist.

Answer: A

Explanation:

In UML, the multiplicity of an association end specifies how many instances of the class at that end can participate in a single association. A lower multiplicity of one (1) at one end of an n-ary (where n > 2) association implies that there must be at least one link that combines the values of the other ends, but it doesn’t require that a link exists for every possible combination. Therefore, it’s possible for some combinations to exist as links, while others do not, which is indicated by the option that links combining the values of the other ends may exist or may not exist. This interpretation is consistent with the definition of multiplicity in associations as outlined in the UML 2.x Superstructure Specification.