The correct format for an email address is:
(B) abc@def.com
Here's why:
* abc: This is the local part or username.
* @: This symbol separates the local part from the domain.
* def.com: This is the domain name, which includes the mail server's name and the top-level domain (.com, .org, .net, etc.).
Let's look at why the other options are incorrect:
* (A) abc.com: This is a website address, not an email address.
* (C) www.abc.email: While this looks website like, it is also not a valid email format.
* (D) abc@def: This is missing the top-level domain (.com, .org, etc.), making it incomplete and invalid.
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