How do you clean the datastore on a Steelhead appliance?

How do you clean the datastore on a Steelhead appliance?
1) > restart empty
2) > reload clean
3) # restart empty
4) # restart clean
5) (config) # reload clean

A.
1, 2

B.
2, 3

C.
4, 5

D.
3, 4, 5

E.
1, 2, 3, 4, 5