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Given a system for keeping birds away from airports One component, described by the following diagram directs audio signals at birds that approach a runway, its parts, as part properties, are typed by blocks.

A systems engineer has identified some blacks that type the pan properties, but as the design becomes more specific, the engineer discovers that these blocks exist in multiple variants.
What modeling choice does the engineer face at this point?

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Given the following diagram:

Which diagram is correct?
A)

B)

C)

D)

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Given the following bdd for a token ring network, in which a token flows from node n to node n+1 except that when it reaches the node at the maximum position n flows to the node at the minimum position.

Which ibd correctly models this behavior?
A)

B)

C)

D)

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Given the following statement machine, and assuming that it starts from initialization:

What is the shortest event sequence that will place this state machine in its final state?

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What is the significance of the verify relationship?