Global form validation rules are designed to:

Global form validation rules are primarily used to maintain the quality and integrity of data submitted through forms. The purpose of blocking specific domains from submitting forms is to prevent spam, bots, or undesirable submissions that may come from known malicious sources. By doing so, organizations can ensure that only legitimate users are able to submit their information.

Implementing this type of validation helps in analyzing data effectively, as it filters out entries that may distort statistics or lead to poor engagement. This check can significantly boost the reliability of lead data collected through forms.

The other choices do not align with the intent of global form validation rules. For instance, ensuring immediate submission is not a validation rule; it rather pertains to form processing. Automatically approving submissions contradicts the notion of validation, which involves checking for accuracy and legitimacy. Redirecting users based on selections pertains more to user experience and functional design rather than a validation framework. Overall, blocking specific domains directly pertains to data validation and integrity.