ICE-6: Marks and Channels with D3.js
1. Bar Chart: Revenue by Category
Comparing total revenue across product categories.
2. Scatter Plot: Units Sold vs Profit
Each point represents one record in the dataset.
3. Multi-Series Line Chart: Revenue, Cost, Profit Over Time
Monthly trends for three quantitative variables.
4. Combined Chart: Revenue (Bars) and Profit (Line)
Comparing revenue and profit together over time.