Final answer:
The IP address 192.168.1.1 is a valid class C IP address for a host, falling within the defined range of 192.0.0.x to 223.255.255.x. Options b, c, and d are not class C addresses.
Step-by-step explanation:
The question asks which of the provided IP addresses is a valid class C IP address for a host. Class C IP addresses range from 192.0.0.x to 223.255.255.x, where x represents the host portion of the address. Given the options, 192.168.1.1 is a valid class C IP address. Option b is invalid because 258 is not a valid octet in an IP address (the maximum value for any octet is 255). Option c, 10.0.0.1, and option d, 172.16.0.1, represent class A and class B IP addresses, respectively.