Which solution should be implemented to ensure that there are no disruptions to internet connectivity?

A company runs an application on Amazon EC2 instances. The application is deployed in private subnets in three Availability Zones of the us-east-1 Region. The instances must be able to connect to the internet to download files. The company wants a design that is highly available across the Region.

Which solution should be implemented to ensure that there are no disruptions to internet connectivity?
A . Deploy a NAT instance in a private subnet of each Availability Zone.
B . Deploy a NAT gateway in a public subnet of each Availability Zone
C . Deploy a transit gateway in a private subnet of each Availability Zone.
D . Deploy an internet gateway in a public subnet of each Availability Zone

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Answer: B