You have an Angular form where users can input an email address. You want to check in real-time whether the email address is already registered in your system. Which type of validation would be suitable for this?
- Async Validators that perform server-side checks.
- Built-in Validators like required and email.
- Custom Synchronous Validators with JavaScript functions.
- Pattern Validators with regular expressions.
To check in real-time whether an email address is already registered, you should use Async Validators that perform server-side checks, allowing you to query the server for existing email addresses.
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