Choose the most appropriate answer in each of the following cases (with a brief justification).

A: Given a channel capacity C shared by N stations that generate data at maximum rates, the CDMA-based transmission of data using M-chip code sequences allows each station to enjoy an effective transmission bandwidth share B, where: (i) B ≈ C N (ii) B ≈ C M (iii) B → C(−) (iv) B ≈ C N+M

B: IEEE 802.3 Ethernet (CSMA/CD) specifies a minimum data packet size, because: (i) Applications always generate large sized data packets (ii) Channel efficiency increases by amortizing the header overhead across a certain minimum packet size (iii) The sender of a packet should transmit long enough to hear any collisions that may occur at the farthest end of bus (iv) The application programming becomes simpler by sending a less number of large-sized packets

C: In comparison to transmission over a wired network, the signal strength over a wireless network decays rapidly with respect to the distance of receiver, because: (i) Signal energy propagates faster over wireless medium than over wired medium (ii) Signal energy propagates in all directions over wireless medium, whereas energy propagates only in the direction of wired medium; (iii) Noise signals are stronger in wireless medium that in wired medium (iv) Signal is sent on a high frequency carrier over wireless medium, whereas signal is sent as baseband over wired medium.