Class B begins at 128 and ends with 18.104.22.168. While answer B is class A, then class C, and D respectively.
In the IPv4 address space certain address blocks are specially allocated or reserved for special uses such as loopback interfaces, private networks, and state-less autoconfiguration (Zeroconf) of interfaces. Such addresses may be used without registration or allocation from Regional Internet Registries (RIRs). However, these address ranges must not be routed into the public Internet infrastructure.
The subnet mask is a bitmask that can be used to separate the bits of the network identifier from the bits …