Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 797 discussion

B. Add multiple MFA devices for the root user account to handle the disaster scenario. By adding multiple MFA devices for the root user account, the company ensures that it can still access the account even if one MFA device is lost. This approach provides a backup for authentication, addressing the concern of losing access to the root user account if the MFA device is lost.

Your AWS account root user and IAM users can register up to eight MFA devices of any type. Registering multiple MFA devices can provide flexibility and help you reduce the risk of access interruption if a device is lost or broken. https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_mfa.html

AnswerB Because a root user can perform privileged actions, it's crucial to add MFA for the root user as a second authentication factor in addition to the email address and password as sign-in credentials. We strongly recommend enabling multiple MFA for your root user credentials to provide additional flexibility and resiliency in your security strategy. You can register up to eight MFA devices of any combination of the currently supported MFA types with your AWS account root user. https://docs.aws.amazon.com/IAM/latest/UserGuide/root-user-best-practices.html#ru-bp-mfa

b looks correct

I'd go for B

Option B