Q-III. (35 pts) Link Layer and LAN - Please answer the following questions: III-1. (4 pts) In CSMA/CD, briefly describe the relation between propagation delay and collision probability (give also the reason). III-2. (4 pts) For wide area cellular networks (such as 3G or LTE), channel partitioning MAC protocols are more appropriate than random access MAC protocols. What could be a reason? III-3. (5 pts) In Cyclic Redundancy Check (CRC), suppose that 5-bit generator G =10001, and data D =1100110011. Find the additional bits R that the sender will append to D