What is a benefit of using multi-factor authentication (MFA) in AWS?

Multi-factor authentication (MFA) significantly enhances security for accessing AWS accounts by requiring users to provide two or more verification factors to gain access. This adds an extra layer of protection, making it much more difficult for unauthorized individuals to gain access, even if they have compromised a user's password. By employing MFA, AWS ensures that only legitimate users can log into the account, thereby safeguarding sensitive data and preventing potential security breaches.

The other options do not directly relate to the benefits provided by MFA. For instance, increased data storage capacity is a function of the cloud storage services themselves and is unrelated to access security measures. Similarly, while MFA may lead to improved oversight and management in user access, it does not inherently reduce costs associated with account management. Finally, MFA does not influence the speed of resource provisioning, which is determined by how the cloud infrastructure operates, rather than by authentication methods.