Final answer:
You cannot work as a Customs officer with a licensed security guard qualification. Customs officers perform specialized law enforcement duties at borders, which require different training from security guards, who can work as loss prevention specialists, mobile security patrols, or bouncers.
Step-by-step explanation:
Of the jobs listed, the one you could NOT perform as a licensed security guard is D. Customs officer. A customs officer is a law enforcement agent who enforces customs laws, on behalf of a government's customs agency. This role involves different responsibilities and authorities compared to a security guard, such as inspecting goods and people crossing international borders, assessing and collecting duties and taxes, and preventing illegal import/export activities. Security guard licensure does not typically extend to the specialized field of law enforcement required for customs work. Meanwhile, as a licensed security guard, you can perform roles like a loss prevention specialist, who works to prevent theft within retail environments; mobile security patrol, where you would patrol and inspect property to prevent and detect signs of intrusion and ensure security; and a bouncer, maintaining security and order in bars, clubs, and events.