Answer: Regularly rotating access keys.

The correct answer is C, 'Rotate access keys on a reoccurring basis.' Regularly rotating access keys is a security best practice as it helps to minimize the risk of unauthorized access in case the keys are compromised. AWS recommends using IAM access last used information to rotate and remove access keys safely. This practice ensures that you are familiar with the process and can act quickly if needed, such as when an employee leaves the company. The other options are not considered best practices: A suggests enabling programmatic access for all IAM users, which can be a security risk if not managed properly; B recommends using IAM users instead of roles, which is not a best practice as roles are more flexible and secure; and D suggests using inline policies instead of customer managed policies, which is not recommended because customer managed policies allow for better organization and reusability of permissions.

Author: LeetQuiz Editorial Team