Option A: Manually registering each cloud account separately is inefficient, especially in multi- cloud environments. This method does not scale well and is prone to human error, increasing the risk of misconfigurations.
Option B: Allowing users to self-register through an open registration link poses significant security risks. It can lead to unauthorized access and increases the attack surface, making the environment susceptible to account takeovers.
Option C: While SSO with MFA enhances authentication security, it is not specifically designed for cloud account registration. It may be useful for user authentication but does not provide the automation and scalability required for efficient multi-cloud registration.
Option D: Using API-based bulk registration with RBAC ensures a secure and automated process, reducing manual effort and enforcing least privilege access. RBAC allows for fine- grained permissions, ensuring only authorized entities can register cloud accounts.