What promotion blend would be most appropriate for producers of the following established products? Assume average- to large-sized firms in each case and support your answer:

(a) chocolate candy bars,

(b) car batteries,

(c) castings for truck engines,

(d) a special computer used by manufacturers for control of production equipment, (

e) inexpensive plastic rain hats, and

(f) a phone case that has achieved specialty product status.