You have an on-premises application that automatically sends email notifications based on a rule. You plan to migrate the application to Azure. You need to recommend a serverless computing solution for the application. What should you include in your recommendation?

A logic app is the correct choice because it is a serverless workflow service that can automate tasks and business processes, including sending email notifications based on triggers and rules, without managing servers. A web app is designed for hosting websites and web APIs, not for automated workflows. A server image in Azure Marketplace would require you to provision and manage a virtual machine, which is not a serverless solution. An API app is a type of web app specifically for hosting APIs, and while it could be part of a larger solution, it doesn't provide the complete workflow automation needed for this scenario as effectively as a logic app.