The internal communication linkages are the most important to the health of the project. Which of the following is one of the major diving forces for effective communication in a project

A) Optimization
B) Differentiation
C) Selection
D) Integration

礼貌待客的要求是：用语文明，尊重客人，提供规范化服务和注重（）。

A、自己的身材

B、客人的职务

C、菜品的种类

D、仪容仪表