To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) It's a Platform as a Service (PaaS) model - This option is correct. Google App Engine (GAE) is indeed a Platform as a Service (PaaS) model, where developers can build and deploy applications without worrying about the underlying infrastructure.
Option B) Automatic Scalability is built in with GAE. As a developer you don't need to worry about application scalability - This option is correct. GAE provides automatic scalability, meaning that it can handle the scaling of your application based on the incoming traffic without the need for developers to worry about it.
Option C) You can decide on how many physical servers required for hosting your application - This option is incorrect. In Google App Engine, developers do not have control over the number of physical servers required for hosting their application. The underlying infrastructure is managed by Google, and developers only need to focus on writing their application code.
Option D) The applications deployed on GAE have the same security, privacy, and data protection policies as that of Google's applications. So, applications can take advantage of reliability, performance, and security of Google's infrastructure - This option is correct. Applications deployed on Google App Engine benefit from the same security, privacy, and data protection policies as Google's applications, ensuring reliability, performance, and security.
Therefore, the incorrect statement is Option C) You can decide on how many physical servers required for hosting your application.
The correct answer is C.