In a pull system, an information flow of external demand is moving and the physical flow of the flow units is moving a. upstream, upstream b. downstream, upstream c. downstream, downstream d. upstream, downstream

option (D)

Explanation:

Pull system is referred to as the lean manufacturing technique which is used in order to decrease the waste in process of production. Under this kind of structure, the elements used in this manufacturing methods are only interchanged once the commodity have been utilized so as the organization only have to produce enough commodities to meet the consumers demand.

the answer to your question is,

old stone age.

-mabel < 3

answer; (true);