What two services could a tech startup use to notify customers of food delivery completion? Select two responses.

The correct choices for notifying customers of food delivery completion would include Amazon SNS and Amazon Lambda.

Amazon SNS (Simple Notification Service) is a fully managed messaging service designed for high-throughput, flexible communication. It allows you to send messages to a large number of subscribers or services, which is perfect for sending notifications to customers. For a tech startup in the food delivery industry, using SNS would facilitate immediate messaging to users via SMS, email, or push notifications as soon as their food delivery is completed, thereby enhancing their customer experience.

Amazon Lambda is a serverless computing service that lets you run code in response to events without provisioning or managing servers. In this scenario, Lambda could be used to run the backend logic that determines when a food delivery is complete and trigger the notification process. For example, once a delivery driver marks an order as completed in the system, a Lambda function could be executed to send a notification through Amazon SNS, ensuring customers are promptly informed.

Choosing other services like Amazon S3 or Amazon EC2 would not be appropriate in this case. Amazon S3 is primarily a storage service, while Amazon EC2 provides compute resources and requires more management overhead, neither of which directly facilitate customer notifications in a straightforward manner.