What must be true for the provision of wireless service in an airport to be considered a public good? a) It must be free and it must include the use of a laptop with no charge also. b) It must be free and it would still be considered a public good even though additional users may crowd people off the network or make it too slow to utilize effectively. c) It must be free and it must have enough excess capacity in the network such that additional users do not reduce the ability of other individuals to utilize the network. d) It must be available to all, but the airport could charge for access to the serv1ce