Which is the best summary of this paragraph?

"Any system that can transmit information across a distance, such as mail, telegram, telephone, or television, may be called a telegraph. Telegraph comes from the ancient Greek words tele, meaning "far," and graphein, meaning "to write." The earliest forms of communication across great distances were probably smoke, fire, and drum signals. The world has come a long way since then. Nowadays, many people exchange electronic mail, or email, addresses. This is because of a relatively new and powerful tool called the Internet, the most modern method of communication we have."

a) Any system transmitting information across a distance can technically be called a telegraph. The use of the Internet for communication is a major advancement over earlier forms of communication.
b) Email has replaced the telegraph as a modern means of communication. Email is an advancement over smoke, fire, and drum signals.
c) Systems transmitting information across a distance are called telegraphs. The word telegraph originates from Greek words. The world has moved forward since ancient forms of communication, and people now exchange email addresses because of the Internet.
d) Systems transmitting information across a distance are called telegraphs. The world has moved forward since smoke, fire, and drum signals, and people now use the Internet.