URL:

• URL is known as Uniform Resource Locator; it is also a type of Uniform Resource Indicator, because, it represents the network location of resource like web pages, graphic files, mp3 files, and so on.
• URL contains:
  • A protocol
  • Web server name
  • Domain name
  • Location of the file

Example: “http://www.mozilla.com”

Here,

• http – HTTP protocol
• www – Web server name or host
• mozilla.com – domain name

Domain Name:

The name given to the IP address is called as domain name. Every domain name is unique and they are text based address.

Explanation for incorrect options:

IP address:

IP address will be in the form of numbers. The name given to the IP address is called as domain name.

Hence, the option “A” is wrong

URL:

URL (Uniform Resource Locator) represents the network location of resource like web pages, graphic files, mp3 files, and so on. URL contains: A protocol, Web server name, Domain name, Location of the file.

Hence, the option “C” is wrong.

User Name:

User name is nothing, but a name given by the user. It is not called as the Internet address.

Hence, the option “D” is wrong.