Before upgrading from vCenter 4.x to 5.x, an administrator runs the vCenter Host Agent
Pre- Upgrade Checker. The Checker reports an issue. What would cause the vCenter Host
Agent Pre-Upgrade Checker to report an issue?

A.
The .NET framework 3.5 is installed.

B.
The host network card is only 1 Gbps.

C.
The file system is not intact.

D.
The VMFS file system is version 4.0.