Explanation
You can move a VM and its associated resources to a different subscription by using the Azure portal.
You can now move an Azure Recovery Service (ASR) Vault to either a new resource group within the current subscription or to a new subscription.
Reference:
https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/move-resource-group-and-subscrip
https://docs.microsoft.com/en-us/azure/key-vault/general/keyvault-move-subscription

Reference:
https://docs.microsoft.com/en-us/azure/architecture/resiliency/recovery-loss-azure-region

Explanation
Box 1: VM1 and VM2 continues to run
When the budget thresholds you've created are exceeded, only notifications are triggered. None of your resources are affected and your consumption isn't stopped. You can use budgets to compare and track spending as you analyze costs.
Box 2: one email notification will be sent each month
Budget alerts for Resource Group RG1, which include VM1, but not VM2.VM1 consumes 20 Euro/day. The
50% ,500 Euro limit, will be reached in 25 days, and an email will be sent.
The 70% and 100% alert conditions will not be reached within a month, and they don't trigger email actions anyway.
References:
https://docs.microsoft.com/en-gb/azure/cost-management-billing/costs/tutorial-acm-create-budgets
https://docs.microsoft.com/en-us/azure/cost-management-billing/costs/cost-mgt-alerts-monitor-usage-spending

Explanation
A virtual network is required when you create a NIC. Select the virtual network for the network interface. You can only assign a network interface to a virtual network that exists in the same subscription and location as the network interface. Once a network interface is created, you cannot change the virtual network it is assigned to.
The virtual machine you add the network interface to must also exist in the same location and subscription as the network interface.
References:
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-network-interface