Which of the following is an example of the third form of cooperation as it is defined in Paragraph 4

A．Students form a study group so that all of them can improve their grades.

B．A new business attempts to take customers away from an established company.

C．Two rival political parties temporarily work together to defeat a third party.

D．Members of a farming community share work and the food that they grow.

下列选项中，属于企业部门结构纵向设计的方法是（）

A：自上而下法

B：自下而上法

C：业务流程法

D：变量测评法