What is the purpose of the file /etc/profile?

What is the purpose of the file /etc/profile?
A .  It contains the welcome message that is displayed after login.
B .  It contains security profiles defining which users are allowed to log in.
C .  It contains environment variables that are set when a user logs in.
D .  It contains default application profiles for users that run an application for the first time.

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Answer: C