OMG Exam OMG-OCUP2-FOUND100 Topic 5 Question 8 Discussion

In a UML sequence diagram, a lifeline is identified by a box at the top of a dashed line that represents the presence of an individual participant in an interaction. The box contains the name of the lifeline, and optionally, it can include the object name and its classifier type.

In the diagram provided, the leftmost lifeline is labeled v[1]:B, which denotes an instance named v[1] of the classifier B. The name of the property that the lifeline represents is v[1], as B is the type of the object that the lifeline represents, and m represents a message, not a lifeline.

Therefore, the correct answer is:

A . v[1]