Networking - TCP/IP - Discussion

I need clear explanation about this question...

Simple there are some ranges for private address.
10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.25

192.168.0.0 - 192.168.255.255
in option A first block is 12 so crosses range. option B first block is 168 does not come in to the range. option c first block 172 is ok but second block is 15 but range start from 16 so wrong. option d is correct one

These ranges on what basis they classified?

But in this question you are not mentioned particular class IP address?

But class of these IP address can be easily guessed on just seeing them and their respective private address can be get further.

What does it mean by private IP address?

In one Particular address like 172.31.255.25.
What is the host address value?

What is the IP address value?
Please can anyone explain?

What does mean of private addressing?

An address is a data structure understood by a network which uniquely identifies the recipient within the network. Addresses in other places than computer networks: Addresses are used by the postal system to allow a postman to find a person's house; to allow a computer to uniquely identify a location in memory.

You should add host addresses for systems that will communicate frequently with the system. You can:

View the entries in the hosts table,
Add an entry to the list of hosts,
Modify the IP address of a host,
Delete a host entry.

Class Private Networks Subnet Mask Address Range.

A 10.0.0.0 255.0.0.0 10.0.0.0 - 10.255.255.255.

B 172.16.0.0-172.31.0.0 255.240.0.0 172.16.0.0-172.31.255.255.

C 192.168.0.0 255.255.0.0.

Address range for C-class 192.168.0.0-192.168.255.255.