Code Challenge if/elseif/else

code-challenge.php

<?php

$post_id = 10;
$image_size = 'thumbnail';

if ( $image_size == 'full' || $post_id < 5 ) {
	// run the if code block
} elseif ( $image_size == 'thumbnail' && $post_id == 10 ) {
	// run the elseif code block
} else {
	// do the else code block.
}