A SysOps administrator is responsible for managing a fleet of Amazon EC2 instances. These EC2 instances upload build artifacts to a third-party service. The third-party service recently implemented strict IP whitelisting that requires all build uploads to come from a single IP address.
What change should the systems administrator make to the existing build fleet to comply with this new requirement?

A. Move all of the EC2 instances behind a NAT gateway and provide the gateway IP address to the service.
B. Move all of the EC2 instances behind an internet gateway and provide the gateway IP address to the service.
C. Move all of the EC2 instances into a single Availability Zone and provide the Availability Zone IP address to the service.
D. Move all of the EC2 instances to a peered VPC and provide the VPC IP address to the service.