Which of the following is an example of synchronous communications?

A) Web log
B) Fax
C) Computer-assisted conference
D) Mail and package delivery
E) Electronic mail

Computer-assisted conference involves real-time communication between multiple parties, making it a synchronous mode of communication. Web logs, mail and package delivery, and electronic mail are all asynchronous modes of communication. Fax can be either synchronous or asynchronous depending on whether it is sent and received in real-time or not.