You have an Azure virtual machine named VM1 that connects to a virtual network named VNet1. VM1 has the following configuration: Subnet: 10.0.0.0/24 Availability set: AVSet Network security group (NSG): None Private IP address: 10.0.0.4 (dynamic) Public IP address: 40.90.219.6 (dynamic) You deploy a standard, Internet-facing load balancer named slb1. You need to configure slb1 to allow connectivity to VM1. You need to apply changes to VM1 as you configure slb1. “Before you create a backend pool on slb1, you must______________________.”