What defines a batch campaign in Marketo?

A batch campaign in Marketo is defined by its ability to search for leads based on specific attributes or past actions, which is what makes option B the correct answer. This type of campaign is designed to target a defined group of leads at a particular point in time, using criteria such as demographics or behaviors that have been recorded in the system.

In practical terms, running a batch campaign involves creating smart lists to segment leads, which can then be added to campaigns that deliver one-time communications or tasks based on the segmentation criteria. This allows marketers to reach out to specific segments with tailored messages, making it an efficient method for marketing communication.

In contrast, campaigns that listen for lead behavior and run on actions are more representative of trigger campaigns, which activate based on real-time lead interactions, hence they do not fit the definition of a batch campaign. Similarly, while automating lead nurturing communications is essential for ongoing engagement, it is typically a function of engagement or nurturing campaigns rather than batch campaigns, which focus on one-off communications. Lastly, a campaign that coordinates live events is distinct and falls under event-driven marketing, which is unrelated to the batch processing of leads for communications.