$19.$ With reference to generic manufacturing strategies. Based on the type of product and the volumes demanded, companies decide on which type of production method to be followed. Explain the ship$-$to$-$stock manufacturing strategy. $(1)$

$20.$ Forecasting is necessary for companies that manufacture items for inventory and that are not made to order. Explain how manufacturers will use material forecasting. $(2)$

$21.$ Discuss each of the four $(4)$ types of purchasing that the purchasing function within the supply chain is responsible for. $(4)$

$22.$ List the three $(3)$ types of partnerships that exist in a supply chain. $(3)$

$23.$ In a paragraph explain the term $$materials management$.($