computer science Software Modeling

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In a State Diagram, which of the following is true? Select TWO choices. Actions associated with a transition are considered to be instantaneous and are interruptible Actions associated with a transition are considered to be instantaneous and are not interruptible Activities associated with states can take longer and cannot be interrupted by any event Activities associated with states can take longer and may be interrupted by some event employer Person Company 0..1 Employment Period Referring to the picture above, select TWO valid statements coherent with this model. A company may have zero employers A person may work for a single company O A person has one employment O A company has one employer that is a person O A company may employ 0 or 1 person Set up Order [ single order] Assign seats [ subscription Assign chairs Award bonus Debit Account charge credit card Mail packet What is the maximum number of concurrent threads that is possible in this activity diagram? 1 O 2 4 O