Which command can you use to set the hostname on a switch?

Which command can you use to set the hostname on a switch?

A.
switch-mdf-c1(config)#hostname switch-mdf1

B.
switch-mdf-c1>hostname switch-mdf1

C.
switch-mdf-c1#hostname switch-mdf1

D.
switch-mdf-c1(config-if)#hostname switch-mdf1