They want to write the code and let the public cloud provider handle (Digital Leader)

Correct answer: C) Serverless computing.
Serverless computing allows organizations to write code without having to manage the underlying infrastructure.
With serverless computing, the cloud provider automatically handles the provisioning, scaling, and management of the infrastructure needed to run the code. This allows developers to focus solely on writing the code for their application's functions without worrying about server management or infrastructure provisioning.
Therefore, option C, serverless computing, is the most suitable infrastructure solution for the organization's requirement to add a new function to their application while letting the public cloud provider handle the infrastructure.