AWS Certified Solutions Architect - Professional (#21)

An organization is making software for the CIA in USA. CIA agreed to host the application on AWS but in a secure environment. The organization is thinking of hosting the application on the AWS GovCloud region. Which of the below mentioned difference is not correct when the organization is hosting on the AWS GovCloud in comparison with the AWS standard region?

The billing for the AWS GovCLoud will be in a different account than the Standard AWS account.
GovCloud region authentication is isolated from Amazon.com.
Physical and logical administrative access only to U.S. persons.
It is physically isolated and has logical network isolation from all the other regions.