ACF PRO 5 add active class to checked items

I'm using ACF Pro. I have created custom field called "Items", it is a checkbox field. Inside that i have four checkbox items "First, second, third and fourth"

Now, i need to print out all checkbox values and assign a class only to checked items.

So, if i check "First" then it will get a class, others are not getting anything, but are still printed out in a list.

With ACF instructions i can print out only one, checked item, but i need to have all items printed out all the time. All checked items will get a custom class to mark it checked.

ACF manual is here: http://ift.tt/1Mvpkb5

Is it possible to achieve?