Suggested Answer:
You can move a VM and its associated resources to a different subscription by using the Azure portal. Moving between subscriptions can be handy if you originally created a VM in a personal subscription and now want to move it to your company's subscription to continue your work. You do not need to start the VM in order to move it and it should continue to run during the move. Reference: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/move-vm
Virtual machines in an existing virtual network can be moved to a new subscription only when the virtual network and all of its dependent resources are also moved. Virtual machines created from Marketplace resources with plans attached can't be moved across subscriptions
https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/move-limitations/virtual-machines-move-limitations?tabs=azure-cli
For a move across subscriptions, the resource and its dependent resources must be located in the same resource group and they must be moved together. For example, a VM with managed disks would require the VM and the managed disks to be moved together, along with other dependent resources.
If you're moving a resource to a new subscription, check to see whether the resource has any dependent resources, and whether they're located in the same resource group. If the resources aren't in the same resource group, check to see whether the resources can be combined into the same resource group. If so, bring all these resources into the same resource group by using a move operation across resource groups. So, answer is the third option
https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/move-resource-group-and-subscription
Use the Azure portal to move a VM to a different subscription
You can move a VM and its associated resources to a different subscription by using the Azure portal.
Go to the Azure portal to manage the resource group containing the VM to move. Search for and select Resource groups.
Choose the resource group containing the VM that you would like to move.
At the top of the page for the resource group, select Move and then select Move to another subscription. The Move resources page opens.
Select each of the resources to move. In most cases, you should move all of the related resources that are listed.
Select the Subscription where you want the VM to be moved.
Select an existing Resource group, or enter a name to have a new resource group created.
When you are done, select that you understand that new resource IDs will be created and that the new IDs will need to be used with the VM after it is moved, and then select OK.
I think I will choose B as my answer..as it just listed "In most cases".
For those who saying B is Yes.
The resource groups can be moved from one to another subscription, if combining is possible then why we are not able to do that without moving resource groups
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