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## Just take a rope, that's easier

Consider the following PHP script:

<?php $diameter = 20; $circumference = 0; function circumference() { ... } circumference(); echo $circumference; ?>

What should be placed at the dots to get (a proper estimate of) the circumference of a circle of 20 px, pt, ex, sea miles, cows or whatever printed in your browser window?

A: `global $diameter; return $circumference = $diameter * 3.14;`

B: `$circumference = $diameter * 3.14;`

C: `global $circumference; $circumference = $diameter * 3.14;`

D: `$GLOBAL["circumference"] = $GLOBAL["diameter"] * 3.14;`

Check all that apply.