What is the default virtual standard switch that is cre…

What is the default virtual standard switch that is created when ESXi is installed on a hypervisor?

A.
vSwitch 1

B.
vSwitch

C.
vSwitch0

D.
vSwitcj2

Explanation:
http://www.rustyhann.com/ESXi-05-Create-vSwitch.pdf (page 3)