Write an aimport rule to apply an external style sheet named mobiledevice.css if the device has a screen with a maximum width of $480$ pixels

$[6$ Marks$]$

Assume there exists an array called Modules populated with all modules offered by the Department of Computer Science and Information Systems. Write HTML and PHP code that will create a drop$-$down list and populate it with the contents of the array.

$[10$ Marks$]$