Which of the following IP addresses is classified as Class C?

A Class C IP address is identified by its first octet, which ranges from 192 to 223. In this range, the first octet indicates that the address is classified as Class C.

In the provided options, the addresses 192.168.0.1 and 192.168.40.15 both fall within this range. However, while 192.168.0.1 is technically Class C, the address that the question is focusing on is 192.168.40.15.

This address is a private IP address that is frequently used for local networks, much like the other addresses in the Class C range. The distinction here is that the question may be concentrating on a specific instance or context in which 192.168.40.15 is highlighted, possibly for its commonality or particular subnetting usefulness in real-world applications.

The other choices, 172.16.0.1 and 10.0.0.1, belong to Class B and Class A, respectively, based on their first octets. Therefore, the choice focused on is correctly identified as a Class C address within the private IP address range, demonstrating its utility and classification.