Final answer:
The cloud model being used is Private Cloud, where customers can connect local networks to the cloud for computing resources while blocking certain applications.
Step-by-step explanation:
The cloud model being used in this scenario is Private Cloud. In a private cloud, the cloud service provider creates an environment where customers can connect existing local networks to the cloud for additional computing resources, while ensuring that certain applications or services are not accessible from the cloud. In this case, the internal HR applications are blocked from reaching the cloud, ensuring their privacy and security.