145, No. 21 Senate Proceedings, Day Sixteen, February 6, 1999, Senate, sitting as a Court of Impeachment, continued consideration of the articles of impeachment against William Jefferson Clinton, President of the United States, receiving the presentation of evidence from the House managers and White House counsel.
However, a possible answer is 2 or more, that is the number of LAN interfaces that appears as outgoing interfaces/next-hops. The serial interface is a separate broadcast domain / IP subnet but it is point to point link. Nothing can be said about the remote IP subnets we can guess that IP subnet 192.168.90.0/24 belongs to a LAN interface of another router. This can be counted as the third broadcast domain.
The network IP addresses for these range from 192.0.0.0 to 223.0.0.0. For a given network address, the last node address is the broadcast address. For example, for the C class network with address 192.168.1.0, the address 192.168.1.255 is the broadcast address, used to transmit to all nodes in that network.