The pilot in command of an aircraft 1 - must comply immediately to all instructions received from ATC. 2 - is responsible only if he is the 'pilot flying'. 3 - may deviate from air regulations for safety reasons. 4 - may be exempt from air regulations in order to comply to an ATC instruction. 5 - may ask for the modification of an unsatisfactory clearance Which of the following combinations contains all of the correct statements?