在创建自由形式的报告时，您可以添加哪些类型的可视化图表？

The correct answer is "You can add tables, line charts, scatter charts, and bar charts." In Google Analytics 4's Free Form exploration, these are the primary visualization types available for analyzing your data. Tables provide detailed data, line charts show trends over time, scatter charts help identify relationships between two variables, and bar charts compare different categories. The other options include visualization types not directly available in Free Form explorations, such as pie charts, donut charts, and geo charts (which are available in other GA4 reports but not as a direct Free Form visualization option), or histogram (which is not a standard Free Form option).