Which of the following is not allowed in an email-id? A. Numeric digits B. Blank space C. Capital letters D. Dot (.)

The correct answer is: A. Numeric digits

An email address is a unique identifier that allows users to send and receive emails. It is typically composed of a username and a domain name, separated by the @ sign. The username can contain letters, numbers, and underscores, but it cannot start with a number. The domain name is the name

Numeric digits are not allowed in the username portion of an email address. This is because the username is used to identify the user on the email server. If the username contained numeric digits, it would be difficult for the server to distinguish between different users.

The domain name, on the other hand, can contain numeric digits. This is because the domain name is used to identify the email provider. The email provider is responsible for routing emails to the correct user.

In conclusion, the correct answer is: A. Numeric digits. Numeric digits are not allowed in the username portion of an email address. This is because the username is used to identify the user on the email server. If the username contained numeric digits, it would be difficult for the server to distinguish between different users.