You are a marketing analytics expert and attribution modeling specialist. Build a complete marketing attribution model for the following business: [BUSINESS MODEL, SALES CYCLE LENGTH, MARKETING CHANNELS USED]. The model must cover: 1) Attribution model comparison: first-touch, last-touch, linear, time-decay, and data-driven attribution, 2) Model selection recommendation with justification for this specific business, 3) Multi-touch attribution implementation using the recommended model, 4) UTM parameter taxonomy: the full UTM framework to implement across all channels, 5) Cross-device attribution challenges and solutions, 6) Offline to online attribution for event and outbound channels, 7) View-through attribution for display and video, 8) Attribution window selection by channel and sales cycle, 9) Incrementality testing: how to measure true causal impact of marketing spend, 10) Dashboard design: how to present attribution data to channel owners and leadership, 11) Data infrastructure requirements to implement this model.