Question:To know your browser and operating system’s information what will you consider? 

A <?php printf("Your browser is:",$_SERVER['HTTP_USER_AGENT']); ?> 
B <?php printf("Your browser is:",$_SERVER['HTTP_USER']); ?> 
C <?php printf("Your browser is:",$_SERVER['HTTP_ADDR_AGENT']); ?> 
D <?php printf("Your browser is:",$_POST['HTTP_USER_AGENT']); ?> 

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A 

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