What is the subnetwork address for a host with the IP address 201.100.5.68/28?

What is the subnetwork address for a host with the IP address 201.100.5.68/28?

A.
201.100.5.0

B.
201.100.5.32

C.
201.100.5.64

D.
201.100.5.65

E.
201.100.5.31

F.
201.100.5.1