Final answer:
Siobhan should pay the parking ticket promptly as it is a personal matter unrelated to her workplace and her professional role as a security analyst.
Step-by-step explanation:
If Siobhan, an (ISC)² member who works as a security analyst, received a parking ticket after work, the appropriate action would be A) Pay the parking ticket promptly. Siobhan should handle personal matters such as parking tickets independently from her professional responsibilities. Paying the ticket promptly is both responsible and ethical, showing respect for laws and regulations. Ignoring the ticket (B) Ignore the parking ticket) could result in additional fines or legal issues. Contesting the ticket (C) Contest the parking ticket in court) is an option if Siobhan believes there was an error, but it is unnecessary unless there are grounds to do so. Asking the employer to cover the ticket (D) Ask the employer to cover the parking ticket) is inappropriate as it is a personal expense unrelated to her role at Triffid Corporation.