Which of the following are recommended security best practices for the AWS account root user?

1.) Keep your AWS account root user access keys in an encrypted file on S3
2.) Set up an IAM user with administrator permissions and do not use AWS account root user for administrative tasks
3.) Share AWS account root user access keys with other administrators
4.) Enable MFA for the AWS account root user
5.) Disable MFA for the AWS account root user as it can lock the entire AWS account if the MFA device is lost