Q.

What is a lifeline?

A. it is a frame consisting of a rectangle with a pentagon inits upper left-hand corner
B. it is a rectangle containing an identifier with a dashed line extending below the rectangle
C. it is a name compartment ; the interaction is represented inside the rectangle
D. none of the mentioned
Answer» B. it is a rectangle containing an identifier with a dashed line extending below the rectangle
Explanation: lifeline is a rectangle containing an identifier with a dashed line extending below the rectangle.
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