AWS Certified Big Data - Specialty (#77)

An administrator tries to use the Amazon Machine Learning service to classify social media posts that mention the administrator’s company into posts that require a response and posts that do not. The training dataset of 10,000 posts contains the details of each post including the timestamp, author, and full text of the post. The administrator is missing the target labels that are required for training. Which Amazon Machine Learning model is the most appropriate for the task?

Unary classification model, where the target class is the require-response post
Binary classification model, where the two classes are the require-response post and does-not-require-response
Multi-class prediction model, with two classes: require-response post and does-not-require-response
Regression model where the predicted value is the probability that the post requires a response