The core point of this question is to understand the function of a personal search agent in the context of job searching. The correct answer is A because a personal search agent helps to monitor the demand for one's profession. Option B is incorrect because it refers to a general preparation rather than the specific function of the agent. Option C is misleading as it suggests constant emails, which is not the primary purpose of the agent. Option D is incorrect because personal search agents typically continue to provide updates even after a job is found.