In the context of Return on Marketing Investment (ROMI), which of the following approaches can be used to isolate the revenue impact of a single investment when multiple marketing activities are running simultaneously? Attribution modeling using a first-touch approach Conducting a Difference-in-Difference (DiD) analysis with control and treatment groups Calculating the Customer Lifetime Value (CLV) for each marketing activity Using a weighted average of the Return on Investment (ROI) for all marketing activities