Which of the following statements is true regarding customer data imported via CSV?

The statement about external IDs not consuming data points is accurate because external IDs are designed specifically to serve as unique identifiers for users. These IDs link users in your system to those in external systems without counting against your data limits. This feature allows for efficient data management and integration with other platforms, ensuring that the primary data points, such as user attributes, are retained without inflating usage metrics.

In contrast, the other options misrepresent how data handling works. For example, the notion that uploaded data will always overwrite existing values is not strictly true, as the import process may depend on specific settings or configurations that dictate whether existing data is updated. The idea that blank values overwrite existing user data is misleading as blank values are typically treated differently during imports; they may not replace any data but could lead to data loss if not managed properly. Lastly, the claim about all uploaded data not counting towards data points is not accurate, as most uploaded data, aside from certain identifiers, would count against your allocated data limits.