Finals mock paper question 6 clarification

[damiwee]

Hi Prof,

May I ask why is option C an incorrect statement? If there is a navigability association from container to lid, is lid not associated with container? Or is "must be associated" referring to multiplicity? Thank you.

[okkhoy]

This is WRT multiplicity. If no multiplicity is given we treat it as 0..1. Must be => multiplicity is 1.