The correct answer, LIB, is the IATA code for Liberia, Costa Rica. IATA codes are three-letter codes used to identify airports and cities around the world. In this case, LIB represents Liberia, which is a city in the Guanacaste province of Costa Rica. By using the IATA code, airports, airlines, and travel agencies can easily identify and refer to specific locations, making it more convenient for travelers and industry professionals.