To identify responders to the first phase of a cross-channel campaign, which table should you filter?

The appropriate table to filter in order to identify responders to the first phase of a cross-channel campaign is the tracking logs. This table specifically records interactions and engagements that recipients have with the marketing communications sent out during a campaign. Tracking logs capture data about email opens, clicks, and other user interactions, making them crucial for assessing the effectiveness of the campaign and determining which individuals responded to the initial phase.

The other options do not focus on measuring direct responses or interactions. Delivery logs provide information about whether the emails were successfully sent or bounced, response logs might provide broader insights into user engagement over time but do not detail specific interactions, and subscriber lists primarily contain information about the contacts without tracking their engagement with specific campaigns. Using the tracking logs ensures that you obtain precise metrics related to user interaction, which is essential for evaluating the campaign's performance.