Which of the following is a valid domain name in an email address? 1. gmail.com 2. outlook.com 3. yahoo.com A. 2 and 3 B. 1 and 2 C. 1 and 3 D. All 1, 2 and 3

The correct answer is D. All 1, 2 and 3.

A domain name is the part of an email address that comes after the @ sign. It identifies the website

or organization that hosts the email account. Valid domain names must follow certain rules, such as:

• They must be at least 2 characters long.
• They must be at most 63 characters long.
• They must start with a letter or number.
• They can contain letters, numbers, and hyphens.
• They cannot contain spaces or special characters.

The domain names in the question, gmail.com, outlook.com, and yahoo.com, all follow these rules and are therefore valid domain names.