Major difficulties arise when multiple projects need to be managed in the functional organizational structure because of （）.

A．the level of authority of the project manager

B．conflicts over the relative priorities of different projects in competition for limited resources

C．project team members who are focused on their functional specialty rather than on the project

D．the need for the project manager to use interpersonal skills to resolve conflicts informally

基层保安公共关系是一种日常存在，并有其特殊的属性。（）