You have an Azure virtual network named VNet1 that contains a subnet named Subnet1. Subnet1 contains three Azure virtual machines. Each virtual machine has a public IP address.
The virtual machines host several applications that are accessible over port 443 to user on the Internet.
Your on-premises network has a site-to-site VPN connection to VNet1.
You discover that the virtual machines can be accessed by using the Remote Desktop Protocol (RDP) from the Internet and from the on-premises network.
You need to prevent RDP access to the virtual machines from the Internet, unless the RDP connection is established from the on-premises network. The solution must ensure that all the applications can still be accessed by the Internet users.
What should you do?
A. Modify the address space of the local network gateway.
B. Remove the public IP addresses from the virtual machines.
C. Modify the address space of Subnet1.
D. Create a deny rule in a network security group (NSG) that is linked to Subnet1.
