Why are the "seven C's" of business communication inadequate?

A.They do not take into account the availability of new technologies such as Twitter

B.They fail to address the need to communicate in different ways, depending on the context and purpose of the message and they assume that the communicator has only a single goal related to the message, but they take into account the availability of new technologies such as Twitter

C.They fail to address the need to communicate in different ways, depending on the context and purpose of the message

D.They assume that the communicator has only a single goal related to the message

E.All of these