What command line utility can be used to upgrade an ESXi host?

A.
esxcli

B.
esxupdate

C.
vihostupdate

D.
esxcfg

Explanation:

You can use the esxcli software profile update or esxcli software profile install command to upgrade or update an ESXi host.
Reference: https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.upgrade.doc%
2FGUID-E51C5DB6-F28E-42E8-ACA4-0EBDD11DF55D.html