What security procedure did the 2006 liquid bomb plot lead to?

• A. 3-1-1 rule
• B. Liquid limits by 2-2-2 rule
• C. 4-2-1 rule
• D. 3-1-2 rule

Answer: (A)

This question tests security measures introduced after the 2006 liquid bomb plot. In response to that threat, aviation authorities restricted liquids in carry-on baggage to prevent large quantities of explosive liquids from being brought aboard. The best-match rule is the 3-1-1 standard: containers must be 3.4 ounces (100 milliliters) or smaller, all liquids must fit in a single clear plastic quart-sized bag, and one bag per passenger. This policy directly limits how much liquid a passenger can take onto a plane and was widely adopted to mitigate the risk posed by liquid explosives. Other proposed rules don’t reflect the actual carry-on liquid restrictions that were put in place after the incident.