4. Predicting whether a customer responds to a particular advertising campaign or not is an example of what? Classification problem Machine learning Regression None of the above

The correct answer is: Classification problem.<br /><br />Predicting whether a customer responds to a particular advertising campaign or not is an example of a classification problem. In this scenario, the outcome is categorical, with the customer either responding to the campaign or not responding. Classification algorithms are used to predict the category or class that an observation belongs to, based on input features. In this case, the algorithm would analyze the customer's characteristics and the advertising campaign's attributes to predict the likelihood of the customer responding to the campaign.