Consider the following use case diagram, is it correct to state that: System Actor D UseCase 1 옷수 ok UseCase 4 UseCase 3

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Consider the following use case diagram, is it correct to state that: System Actor D UseCase 1 옷수 ok UseCase 4 UseCase 3 Actor E UseCase 5 «extend UseCase 6 a. Since UseCase 1 is higher up than UseCase 2 and does not have any dependencies, UseCase 1 will be undertaken first. b. As actor F is on the right-hand side of the diagram, F denotes an external software system. C. Extension points determine the conditions under which UseCase 6 will be undertaken. d. Actor E may interact with both UseCase 1 and UseCase 2. e. UseCase 5 can be undertaken irrespective of whether UseCase 3 or UseCase 6 are undertaken. «include> «extend UseCase 2 ok Actor F