The best approach for managing access while enhancing the cloud infrastructure's security involves issuing time-limited access tokens or certificates that expire after a single session or shortly thereafter. This method significantly narrows the chance for attackers to misuse these credentials. Such an approach stands out for ensuring temporary access is securely managed while upholding high security standards. Other methods, like deploying SSH keys and issuing VPN credentials, might not provide the same security level because, if compromised, they could allow prolonged unauthorized access due to their typically longer validity. Furthermore, enforcing password resets after every use, although potentially beneficial in certain scenarios, is less effective as it does not naturally restrict access duration and can lead to operational inefficiencies.