given the string var johnphp net which of following will extract..., PHP String Operation, PHP

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Question:Given the string:
$var = "john@php.net";

Which of the following will extract the TLD (top level domain) of ".net" from the string?

A strstr($var, strpos($var, ".")); 
B substr($var, strpos($var, "@")); 
C substr($var, strstr($var, ".")); 
D substr($var, strpos($var, ".") + 1); 
E substr($var, strpos($var, "."));

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Question:Given the string: $var = "john@php.net"; Which of the following will extract the TLD (top level domain) of ".net" from the string?

A strstr($var, strpos($var, "."));

B substr($var, strpos($var, "@"));

C substr($var, strstr($var, "."));

D substr($var, strpos($var, ".") + 1);

E substr($var, strpos($var, "."));

E