What are the answers to the following questions about the World Wide Web, email, and search engines?

Here are the answers to the questions:

1. b) The World Wide Web was introduced in 1989.
2. c) The symbol used in an email address is @.
3. c) The file sent with email is called an Attachment.
4. b) BCC stands for Blind Carbon Copy.
5. a) Yahoo.com is a Search engine.