What does a loop fragment in a sequence diagram indicate?a.The duration of time during which an object is actively processing a messageb.A loop structure within the sequence of messagesc.A conditional behavior in the sequence of messagesd.The vertical space allocated for an object, showing its existence over time

In a sequence diagram, what does a nested activation bar represent?a.The duration of time during which an object is actively processing a messageb.The vertical space allocated for an object, showing its existence over timec.A combined fragment representing a conditional behaviord.A loop structure within the sequence of messages

In a sequence diagram, what does a synchronous message indicate?a.The sender must wait for a response before continuing its executionb.The message is broadcasted to multiple objects simultaneouslyc.The message is exchanged between objects of the same classd.The sender can proceed with its execution before receiving a response

What is the purpose of a return message in a sequence diagram?a.To represent a loop or conditional behaviorb.To indicate the completion of a method call and the return of control to the callerc.To define the attributes of an objectd.To show the order of messages exchanged between objects

The concept of ‘loop’ is used in

You can use synchronization bars to indicate looping in an activity diagram.