Question:To know your IP address what will you select? 

A <?php printf("your IP address:%s",$_SERVER['HTTP_USER_AGENT']); ?> 
B printf("your IP address:%s",$_SERVER['REMOTE_ACCEPT']); 
C printf("your IP address:%s",$_SERVER['REMOTE_POST']); 
D printf("your IP address:%s",$_SERVER['REMOTE_ADDR']); 

+ Answer
D 

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