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3. The 4Ps model tells us that the application of marketing principles will require decisions to be made about the products which will be offered. Such decisions will involve the following: A) Route network and type of aircraft B) Route network, type of aircraft, and frequencies and timings of flight operation C) Route network, type of aircraft, and frequencies and timings of flight operation, and products and services to be offered D) Route network, type of aircraft, and frequencies and timings of flight operation, products and services to be offered, and the dress code of the airline employees