The syntax of the procmail configuration file is?

The syntax of the procmail configuration file is?

A.
:0[flags][:[lockfile]]
[* condition]
action

B.
[* condition]
action
:0[flags][:[lockfile]]

C.
:0[flags][:[lockfile]]
[* condition] action

D.
:0[flags][:[lockfile]]:[* condition]
action

E.
:0[flags][:[lockfile]]:[* condition]:action