Final answer:
The valid subnet addresses are 192.168.1.0 and 192.168.3.0.
Step-by-step explanation:
The question asks for valid subnet addresses given a network address and a subnet mask. To determine if a subnet address is valid, we need to compare the network address and the subnet mask.
The network address is the base IP address on which the network is built. In this case, the network address is 192.168.0.0.
The subnet mask is used to divide the network into subnets and host addresses. In this case, the subnet mask is 255.255.252.0, which means the first two octets of the network address are fixed, and the third octet can range from 0 to 3, giving valid subnet addresses of 192.168.0.0, 192.168.1.0, 192.168.2.0, and 192.168.3.0.
Therefore, the valid subnet addresses from the given options are a) 192.168.1.0 and c) 192.168.3.0.