• method of exchanging digital messages across the Internet
• Predates and was crucial to the establishment of the Internet
• Started in 1965 as a way for multiple users of a time-sharing mainframe computer to communicate with one another

The list above is describing
A. personal computers
B. the World Wide Web
C. Microsoft Windows
D. electronic mail

Electronic mail

Explanation:

Electronic mail is the exchange of messages between people using electronic devices. Electronic mail predates and was also crucial to the establishment of the Internet.

Electronic mail (E-mail) started in 1965 as a way for the multiple users of a time-sharing mainframe computer to communicate and send amesages across to each other.

i dont know but i need points

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."