In Engagement Studio programs within Pardot, the paths that prospects take can be defined by various triggers based on their actions or statuses. The following are valid triggers:

List membership: This trigger checks if the prospect belongs to a specific list, allowing for tailored engagements based on list segmentation.

Email open: This monitors whether a prospect has opened an email, serving as a behavioral trigger for further actions.

Custom redirect click: This trigger checks if the prospect has clicked on a custom redirect link, which is often used to track engagement with specific content or calls to action. These triggers help in dynamically steering prospects through different paths based on their interactions with marketing materials.