Is the extent to which a company's supply chain is focusing on minimizing procurement, production, and transportation costs. select one:

a. supply chain visibility

b. supply chain efficiency

c. supply chain analytics

d. supply chain effectiveness

e. supply network collaboration

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?