Final answer:
Azure Security Center features are not all free; some features require a paid subscription.
Step-by-step explanation:
The statement 'All Azure Security Center features are free' is False. While Azure Security Center provides some free features, there are also premium features that require a paid subscription.
For example, the free tier of Azure Security Center provides basic security recommendations and alerts. However, advanced threat protection and features like just-in-time VM access require a standard or standard-tier subscription.
It's important to review the specific pricing and feature details on the Azure website to understand which features are included for free and which require payment.