Which metrics would you use to assess the effectiveness of a cross-channel promotional campaign targeting new customers vs. existing customers?

• A. New customer metrics (CAC, first purchase ROAS, new customer growth) and existing customer metrics (retention rate, LTV, repeat purchase rate, cross-sell/AOV).
• B. Only email open rate and click-through rate.
• C. Short-term sales velocity and weekly revenue.
• D. Brand sentiment on social media.

Answer: (A)