![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
Project managers must know:AWhat kind of message to sendBto whom to send the messageChow t
Project managers must know:
A What kind of message to send
B to whom to send the message
C how to translate the message into a language that everyone can understand
D All of the above
E A and B only
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)