Ace the Google Cloud Certified Associate Engineer Exam 2025 – Skyrocket Your Cloud Skills!

There are a few key pieces of information in this question which can help us explain why B is the correct answer. First, we are told that the question is asking about how to deploy an App Engine application using the command line. This means that we can eliminate options A and C, as they don't mention anything about deploying an application. Additionally, option D includes the word "release" which is not mentioned in the question, so we can eliminate that option as well.

That leaves us with option B, which is the correct answer. This option specifically mentions deploying using the command line and references the app.yaml file, which is typically used for configuring App Engine applications. This option tells the command line to deploy the application, while also referencing the app.yaml file for the necessary configuration.

In summary, while options A, C, and D may involve aspects of deploying an App Engine application, they do not specifically mention using the command line or the app.yaml file, which is why they are incorrect. Therefore, option B is the correct answer for deploying an App Engine application using the command line.