Which of the following can be used as an additional security layer for the user name and password when logging into the AWS Console?

Answer options:

A.Multi-Factor Authentication (MFA)
B.Secondary password
C.Root access privileges
D.Secondary user name

Answer – A
The AWS Documentation mentions the following:
AWS Multi-Factor Authentication (MFA) is a simple best practice that adds an extra layer of protection on top of your user name and password. 
For more information on the AWS MFA, please refer to the below URL:
https://aws.amazon.com/iam/details/mfa/