What Are the Steps Involved in Designing a Client/server Application

Multiple Choice

What are the steps involved in designing a client/server application?
I. Design a communication protocol.
II. Test the server with the Telnet program.
III. Implement the server program.
IV. Write a client program.

A) Only I
B) Only I and II
C) Only I, II, and III
D) I, II, III, and IV