What is the difference between a vApp network and a Fenced vApp network?

What is the difference between a vApp network and a Fenced vApp network?

A.
A vApp network will automatically create a NAT.

B.
A Fenced vApp network will automatically create a NAT.

C.
A Fenced vApp network will automatically create a DHCP Pool.

D.
A vApp network will automatically create a DHCP Pool.