Which service is designed to handle outbound data transmission in a secured manner?

AWS Direct Connect is the correct answer because it provides a dedicated network connection from your on-premises data center to AWS, enabling secure and reliable outbound data transmission. By utilizing Direct Connect, organizations can establish a private connection to AWS that bypasses the public internet, reducing the risks associated with data transmission such as interception or exposure to malicious activities. This service supports secure data handling and is ideal for high-bandwidth applications that require stable and consistent network performance.

The other options do not focus specifically on outbound data transmission in a secured manner. For instance, Amazon S3 Glacier is primarily used for archiving and long-term data storage rather than managing outbound data transmission. Amazon EC2 is a compute service that allows you to run virtual servers but does not inherently handle outbound data security features. AWS CloudFormation is a service designed for infrastructure as code, enabling users to manage AWS resources through templates, but it does not specifically address secure outbound data transmission.