Filtering is a concept that occurs when:过滤这个概念在什么时候出现?
A technique used in conjunction with a project communication plan一个技术结合项目沟通计划使用时
B. The supervisor performs verification and documentation of the results of a communications message监督人执行沟通信息审核和文档记载时
C. A large portion of the message was lost in upward or downward communications between a subordinate and supervisor 在上下级之间的沟通中大部分信息丢失
D. A and B,A和B