What does an alt combined fragment represent?

What does an alt combined fragment represent?

• A. Three or more parallel event paths
• B. Two or more alternative sets of event occurrences that could happen during an execution
• C. A single optional path
• D. A looped sequence of events

Answer: (B)

An alt combined fragment models a decision point where there are two or more alternative sequences of steps, and only one of them runs for a given execution based on conditions. Each alternative path has a guard that determines when that path is taken. This is different from parallel execution (where multiple paths run at the same time), from an optional path (which may or may not occur), and from a loop (which repeats). For example, in a checkout workflow you might branch to a card payment path or a cash payment path depending on the chosen method; the alt fragment selects the appropriate sequence accordingly. This captures the idea that two or more alternative sets of event occurrences could happen during an execution, with one chosen.

An alt combined fragment models a decision point where there are two or more alternative sequences of steps, and only one of them runs for a given execution based on conditions. Each alternative path has a guard that determines when that path is taken. This is different from parallel execution (where multiple paths run at the same time), from an optional path (which may or may not occur), and from a loop (which repeats). For example, in a checkout workflow you might branch to a card payment path or a cash payment path depending on the chosen method; the alt fragment selects the appropriate sequence accordingly. This captures the idea that two or more alternative sets of event occurrences could happen during an execution, with one chosen.