Final answer:
The statement that a message in a sequence diagram is considered to be an action invoked on the destination object is true. Sequence diagrams are part of interaction diagrams used to visualize how objects interact through messages, indicating the sequence of these interactions.
Step-by-step explanation:
In a sequence diagram, a message is indeed considered to be an action that is invoked on the destination object, so the correct answer to the student's question is 1) True. A sequence diagram is a type of interaction diagram that shows how processes operate with one another and in what order. It's a construct of a message sequence chart. A message in a sequence diagram is used to represent the communication between different objects in the system, where an object can send a message to another object to invoke a method or a function. Therefore, it acts as a representation of an action being taken.