A host with an IP address of 192.168.20.80/26 wishes to communicate with a host at 192.168.20.60. Which of the following could be correct? (The other three are absolutely wrong) Select one: O a. The host at 192.168.20.80 creates a frame addressed to the MAC address of the host at 192.168.20.60. O b. The host at 192.168.20.80 creates a frame addressed to the MAC address of the gateway at 192.168.20.1. O c. The host at 192.168.20.80 creates a frame addressed to the MAC address of the gateway at 192.168.20.65 O d. The host at 192.168.20.80 creates an ARP request for 192.168.20.60 to learn of its MAC address Where would you expect to see Carrier Sense, Multiple Access / Collision Detection (CSMA/CD) used? Select one: O a. In a shared media environment. O b. In a switched environment where full duplex is used between the switch and the hosts. O c. Over a point to point wide area network link. O d. With optic fibre cable.