Which of the following variables does PHP use to authenticate a user?
1. $_SERVER[‘PHP_AUTH_USER’].
2. $_SERVER[‘PHP_AUTH_USERS’].
3. $_SERVER[‘PHP_AUTH_PU’].
4. $_SERVER[‘PHP_AUTH_PW’].
A. 1 and 2
B. 2 and 4
C. 1 and 4
D. 2 and 3
Answer: Option C
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