The vSphere 4 Host Update Utility upgrades the (Choose Two):

A.
service console if present

B.
VMFS datastores

C.
virtual machine hardware

D.
VMkernel

Explanation:
vSphere Upgrade Guide, ESX 4.0, ESXi 4.0, vCenter Server 4.0, vSphere Client 4.0, page 67
‘vSphere Host Update Utility

Graphical utility for standalone hosts. Allows you to perform remote upgrades of ESX 3.x/ESXi 3.5 hosts to ESX 4.0/ESXi 4.0. vSphere Host Update Utility upgrades the virtual machine kernel (vmkernel) and the service console, where present. vSphere Host Update Utility does not upgrade VMFS datastores or virtual machine guest operating systems.’