You work as a network administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers on the ABC.com network have Windows Server 2012 R2 installed. The Hyper-V server role is installed on a server named ABC_SR07.ABC_SR07 has a legacy network card that you use when creating a virtual machine named ABC_VT01. What is the first thing you should do when assigning bandwidth to ABC_VT01？（）
- AYou need to install a Hyper-V Virtual Switch on ABC_SR07.
- BYou need to install Integration Services on ABC_VT01.
- CYou need to remove the legacy network card and replace it with a new one.
- DYou need to install a second legacy network card on ABC_SR07.
- EYou need to create an external virtual network.