History of email addressing (@ symbol): In which year was the '@' character formally chosen for use in e-mail addresses? Ray Tomlinson selected '@' to separate the user name from the host/computer name on ARPANET. Choose the correct year.

Given data

• Ask: The year the '@' symbol was adopted for e-mail addressing.

Concept/Approach
Engineer Ray Tomlinson implemented the first networked e-mail between computers on ARPANET and chose the @ symbol to separate user and host names.

Step-by-step reasoning
• ARPANET experiments began in the late 1960s.• The specific adoption of '@' for addressing occurred in 1971.

Common pitfalls
Confusing the start of ARPANET (1969) or later RFC formalizations with the actual year of the '@' convention.

Final Answer
1971