After executing the displaospf lsdb command on the MSR router RTA, the router output is as follows:

From the above output, you can judge _______.

A network is connected to the Internet through a 64kbps wide area link. The customer requires that the bandwidth of this link is used as efficiently as possible.
You should use _______ to connect to the Internet.

XZ company requires to build its network based on the modular enterprise network architecture. XZ has one R&D base in Shenzhen and Xi'an each; one office building in Beijing and Shanghai each; offices with more than 50 people in 23 capital cities; small offices with no more than 8 people in 200 small and medium-sized cities; There are usually more than 200 market and technical personnel on business trips at any given time. Due to environmental and cost issues, some offices cannot access the headquarters through dedicated lines or packet-switched wide area network connections. According to these circumstances, the network module XZ company should have is ________.

K is shown in the figure, RTA, RTB, and RTC run OSPF, and the process number is 100; OSPF process 200 runs between RTA, RTB, and RTD. The cost of all interconnected links is set to 10. Set the external route priority of OSPF 100 on RTA and RTB to 190, and import an external route 172.16.1.0/24 into OSPF 100 on RTC. Both RTA and RTB are configured to re-import OSPF100 routes into OSPF200.
According to the above scenario analysis, the following description about RTD learning external routing 172.16.1.0/24 is correct.

In the topology shown in the figure, the following configuration is performed on RTA and RTB respectively
RTA-ospf-1-area-0.0.0.1] network 192.168.0.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1] network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1] network 192.168.2.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1] network 192.168.3.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1] network 192.168.4.0 0.0.0.255
Now it is required that the RTC must not learn the routes configured in the above RTA. What configuration can be performed on the router?