E-Commerce?

E-Commerce has recently been the major subject of discussion over every gatherings around the world.
which of the following best describes E-Commerce?
a)chatting with your friends over the internet
b) buying of good by placing orders through phone lines
c) secure buying and selling of goods and services over the internet using credit cards
d) there is nothing known as E-Commerce.Correct name of it is F-Commmerce.

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