PMP Practice: Analyze stakeholders

Sienna O'Brien-Callahan is leading an agile project at Lattice Bolt Media to develop a customer-facing mobile app for tracking fitness goals. The project has diverse stakeholders: the marketing director wants frequent visibility into feature progress to plan campaigns, the compliance officer needs quarterly assurance that data privacy requirements are met, end users want to provide ongoing feedback on usability, and the executive sponsor prefers high-level monthly updates on business value delivered. The team is preparing their stakeholder engagement approach for the first release cycle. Which approach would be MOST effective for engaging these stakeholders?