Which of the following is not valid about an e-mail address?

Correct option is D

The correct answer is (d) e-mail Address can have any number of @ symbol
Explanation:
● A valid email address must contain exactly one "@" symbol to separate the user and domain.
● Spaces are strictly prohibited in email addresses.
● Dots can be used in the username or domain parts.
Information Booster:
● The "@" symbol was chosen by Ray Tomlinson in 1971.
● The maximum length of an email address is usually 254 characters.
Additional Knowledge:
● Case sensitivity is usually ignored by most email servers for the domain part.