Which notation represents an asynchronous message?

In modeling, asynchronous messages are represented to convey that a sender can send a message without needing to wait for a response from the receiver. The notation for an asynchronous message is characterized by a specific line type and arrowhead design.

The correct notation involves a solid line along with an open arrowhead. This signifies that the message can be sent without requiring immediate acknowledgment, allowing the sender to continue processing other tasks. The solid line indicates a more persistent connection than a dotted line, which typically signifies a different type of interaction, and the open arrowhead reinforces that the sender does not wait for a response.

Understanding this notation is essential in constructing accurate models that depict various interactions between components, particularly in systems where the timing and sequence of messages are crucial. This clarity helps in communicating the intended behavior of the system to stakeholders effectively.