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1)

a. e-commerce is not possible without the internet since e-commerce publishes ads or commercials on the web for use of business.

b. B2B - Business 2 business
B2C - Business 2 Customer
C2B -Consumer-to-Business
C2C - Customer 2 customer

c. Characteristics: An intranet can serve its constituents faithfully, as long as network bandwidth suffices to meet user demands. As more intranet applications become available and more organizations and users begin to appreciate what they can do, demand will rise dramatically.The Web is platform neutral and global, and Web browsers function as universal clients. Web technology is based on open standards, is available for nearly all leading operating systems and hardware platforms, and can leverage legacy database systems.