The sets of firms that supply companies with the raw materials, components, parts, information, finances, and expertise needed to create products or services are known as .

Upstream Supply Chain

Explanation:

From the question, we are informed about The sets of firms that supply companies with the raw materials, components, parts, information, finances, and expertise needed to create products or services.

These set of firm are are known as Upstream Supply Chain. Upstream Supply Chain allows the firm and the organization supplier to maintain a good relationship, it is focus on the raw material in the supply chain process. the Upstream Supply Chain helps the firm in the information, raw product analysis for good product and services output

Option (5) is correct.

Explanation:

Now as per the overhead costs, when there is an increase in the volume of production then as a result fixed costs remains the same at the installed level but afterwards it falls and unit variable cost remains the same at the increased level of production.

So, the correct option is unit fixed cost decreases, unit variable cost remains constant.