300
What are the 3 phases of Weiser and Brown's history and future of computing:
a) Mainframe Era, PC Era, Ubiquitous Computing
b) PC Computing, Ubiquitous Computing, MAC Computing
c) Mainframe Era, Uniquotous Computing, Virtual Reality
d) Virtual Reality, PC Era, Ubiquiotous Computing
A. What is Mainframe Era, PC Era, Ubiquitous Computing