php echo port 80s default service is getservbyport 80..., PHP Advanced Concepts, PHP

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Question:<?php
   echo "Port 80's default service is: ".getservbyport(80, "tcp");
?>
The code returns the following:

A Port 80's default service is:www 
B Port 80's default service is: 80, tcp 
C Port 80's default service is: 80, Port 
D Port 80's default service is: getservbyport(80, "tcp").

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Question:<?php echo "Port 80's default service is: ".getservbyport(80, "tcp"); ?> The code returns the following:

A Port 80's default service is:www

B Port 80's default service is: 80, tcp

C Port 80's default service is: 80, Port

D Port 80's default service is: getservbyport(80, "tcp").

A

Question:
<?php echo "Port 80's default service is: ".getservbyport(80, "tcp"); ?>
The code returns the following: