Which Azure Information Protection label is best to safeguard customer details and passwords?

The choice to apply the "Highly Confidential" label to safeguard customer details and passwords is the best option because this label is designed specifically for sensitive information that requires the highest level of protection. Customer details and passwords are critical data points that, if compromised, could lead to significant security breaches and privacy violations. By utilizing the "Highly Confidential" label, you ensure that stringent access controls and encryption are applied, preventing unauthorized users from accessing or sharing this information.

In contrast, the other labels do not provide the necessary level of protection for sensitive data. The "Personal" label is intended for nonbusiness use and does not address the security needs of sensitive business information. The "Confidential" label may suggest that the information is sensitive, but allowing all employees access undermines the intent to protect customer data. Lastly, the "Public" label is inappropriate, as it denotes information that can be shared broadly, which contradicts the need to secure customer details and passwords. Hence, the choice of the "Highly Confidential" label is the most effective measure for safeguarding this type of sensitive information.