以下说法正确的是( )。 ①报刊、书籍等不得泄露秘密；②对外的交往与合作必须严守国家秘密；③召开属于国家秘密的会议，在采取保密措施的同时，并要进行保密教育；④不准在公共场合谈论国家秘密；⑤任用国家经管人员必须具备相当高的素质

A．①②③④⑤

B．①②③④

C．①②④⑤

D．①③④

A PM's boss and the head of engineering discuss a change to a major task. After the meeting, the boss contacts the project manager and tells him to make some changes. This is an example of ______ .

A．management attention to scope management

B．management involvement in planning

C．change control board meeting

D．a project coordinator position