Which limitation could cause a potential issue for UC?

Universal Containers (UC) is building a new self-service site for its large global customer base. Customers will be posting questions, viewing Knowledge articles, downloading warranties, opening tickets, and registering their recent purchases. Purchases are stored in a custom object. UC has decided to use Customer Service template for the experience and Customer Community Plus license for the customers.

Which limitation could cause a potential issue for UC?
A . Customer Service template does not allow downloading documents out-of-the-box.
B . Customer Service template does not allow record pages for custom objects out-of-the-box.
C . Customer Community Plus license does not allow access to custom objects.
D . Customer Community Plus license allows only up to 2 million users per org.

Answer: D