Which of the following sequences of actions are within the set of behaviours described by the Activity Diagram shown below? Please justify your answer if it is negative.

1- Which of the following sequences of actions are within the set of behaviours described by the Activity Diagram shown below? Please justify your answer if it is negative.
a. ABC
b. BACBD
c. ABD
d. ABCD
e. BBCD
2- Model a door using a UML State Machine diagram, considering the following requirements:
The door can be in one of two primary states: Open or Closed, but not both.
.The door can be Locked in either the Open or Closed state
Once the door is Locked, the Lock operation can only be executed once (key can be turned only once).

A Locked door cannot be Opened without being Unlocked first.
If the door is Open and Locked, it cannot be Closed without being Unlocked first.
Initially, the door is Open and Unlocked.
Draw the UML State Machine diagram based on these requirements.
3- The following Use Case diagram describes the function “make call” of a Call Centre Application Please see the attached file

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