RTA and RTB send and receive only RIPv2 messages. RTC receives both RIPv1 and RIPv2 but sends only RIPv1. Consequently, RTA and RTB do not have subnet 192.168.13.75/27 in their route tables. Although it receives the updates from RTA and RTB, RTC does not have subnets 192.168.13.90/28 and 192.168.13.86/29 in its route table because it interprets both of them as 192.168.13.64/27, which is directly connected to RTC's E0 interface.
2
Yes. Subnet 192.168.13.64/27 will be added to the route tables of RTA and RTB because they can now receive RIPv1 updates from RTC.
