A network portion is the portion of the network layer address which router uses to forward packets.
When a router receives a packet, it examines the network portion of the destination address to determine which network the packet should be forwarded to. The network portion of the address identifies the specific network segment to which the packet belongs.
Routers maintain routing tables that map network addresses to the appropriate outgoing interface, allowing them to make informed decisions about where to send the packet.
The host portion of the address is used to identify individual devices within a network and is not relevant for routing decisions. Broadcast addresses are used for sending data packets to all devices within a specific network segment and are not used for routing between networks.
Therefore, the Option C is correct.