Which of the following is suitable as a description of data transmission by personal computers using an ISDN basic rate interface?
a) If a TA (terminal adapter) is used, then the TA handles all protocol processing required for communication and there is no need to install a communication program in the personal computer.
b) It is not necessary to have two telephone numbers (one for the personal computer and one for telephone use), even in cases where data communication is performed by the personal computer while the user is talking on the telephone.
c) In cases where the personal computer’s RS-232C port is used, a TA is not needed if there is a DSU (digital service unit).
d) Data communication can take place at speeds up to 64 Kbps when two B channels are used at the same time.