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Error When Attempting to Install .NET 3.5 on Server 2012 R2

I have Windows Server Datacenter 2012 R2 (volume license version) installed on a VM server that a contractor is attempting to install the .NET 3.5 feature on, but it keeps producing the following error.

"Installation of one or more roles, role services, or features failed.
The source files could not be found. Try installing the roles, role services, or features again in a new Add Roles and Features Wizard session, and on the Confirmation page of the wizard, click "Specify an alternate source path" to specify a valid location of the source files that are required for the installation. The location must be accessible by the computer account of the destination server."

When using the following command I get the same thing plus error code 0x800f081f.

"DISM /Online /Enable-Feature /Featurename:NetFX3 /Source:G:\sources\sxs /LimitAccess"

I get these error messages if I point the installer to the source files mounted on the DVD drive as well as if I do not. The path you see in the DISM command is the correct path for the SXS folder on the Server Datacenter 2012 R2 Installer disk ISO.
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Just need to close the ticket. All information above is good.