Extend powershell script

Hi all. Last week the good folks of EE provided me some wonderful support in providing the script below, which works perfectly. I have a request that will extend the script.  Currently, the script looks in the source file c:\temp\servers.txt, and what ever server names are in there the script runs again.

What about this scenario. What if instead of the txt file I had a csv file with 2 columns. column one named VM Name, column two is called Resource Group. So essentially I have two columns with VM names and Resource Group names. Could the script be manipulated so that the script runs only against the VMs if they are in a particular Resource Group?
 Example, I have 3 vm names but I only want the script to run against the vms in RG1?  See below for existing script.


VM Name         Resource Group Name
vm1                           RG1
vm2                           RG1
vm3                           RG2

Param(
	[Parameter(Position=0, Mandatory=$true, HelpMessage="Name of the KeyVault")]
	[string]$KVName,
	[Parameter(Position=1, Mandatory=$true, HelpMessage="Name of the KeyVault Resource Group")]
	[string]$KVResourceGroup,
	[Parameter(Position=3, Mandatory=$true, HelpMessage="Name of the VM Resource Group")]
	[string]$VMResourceGroup
)
$keyVault = Get-AzureRmKeyVault -VaultName $KVName -ResourceGroupName $KVResourceGroup

$splat = @{
	ResourceGroupName = $VMResourceGroup
	DiskEncryptionKeyVaultUrl = $keyVault.VaultUri
	DiskEncryptionKeyVaultId = $keyVault.ResourceId
}

foreach ($VMName in Get-Content -Path C:\temp\servers.txt)
{
  Set-AzureRmVMDiskEncryptionExtension @splat -VMName $VMName
}

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