Answer:
d. automation engineer
Step-by-step explanation:
As per the given information, Jake designs machines for assembling robots in a professional firm, which indicates his involvement in automation and robotics engineering. "Automation engineer" would be a more suitable designation for someone involved in designing machines for assembling robots, as it aligns with the job responsibilities mentioned. Other options such as "robotics engineer," "robotics technician," and "robotics technologist" could also be relevant depending on the specific job responsibilities and qualifications, but based on the information given, "automation engineer" would be the most appropriate choice. "Software quality specialist" does not align with the given information, as it does not mention any involvement in software or quality assurance.