Which of the following is NOT considered a prohibited article under Ryanair's security measures?

The correct answer is that knives are considered prohibited articles under Ryanair's security measures. However, the choice indicating knives actually might suggest some confusion about what is deemed acceptable in certain contexts. Generally, international aviation security protocols classify knives, particularly those with blades longer than a specific length, as dangerous items, thereby prohibiting their carriage in carry-on baggage. This aligns with the safety regulations that are critical for ensuring a secure environment on flights.

Teaser, in this context, is not commonly recognized among prohibited articles in aviation security, which is why it might have been selected as an option. Unlike firearms, knives, and pepper spray—items that pose clear risks—teasers do not typically fall under standard security restrictions, further clarifying their status compared to more dangerous items. Understanding these distinctions is fundamental for anyone involved in airport security or passenger travel.