Create new VM -VMsize

Hello, 

I am trying to make a new VM using the command:

$vmName = "vSQLUAT"

$vmConfig = New-AzureRmVMConfig -VMName $vmName -VMSize "Standard_A2"

However instead of a Standard_A2 I want to use a D3 v2 Promo, what do I need to put in place onf "Standard_A2" to achieve this? Is there a list of options for the -VMSize option?