A systems administrator is troubleshooting performance issues with a Windows VDI environment. Users have reported that VDI performance has been slow since the images were upgraded from Windows 7 to Windows 10. This VDI environment is used to run simple tasks, such as Microsoft Office. The administrator investigates the virtual machines and finds the following settings:
– 4 vCPU
– 16GB RAM
– 10Gb networking
– 256MB frame buffer
Which of the following MOST likely needs to be upgraded?

A. vRAM
B. vCPU
C. vGPU
D. vNIC