How to connect a class B bus topology and class C star topology using router ospf in packet tracer

requirements:
bus topology- use 3 hubs as your backbone and assign your computers with class B network using ip address 128.0.0
star topology- use a hu b to connect your computers in a star form then assign your computers with class C network using ip address 192.168
using a router we do open short path first protocol for a successful communication of the computers within the network

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