Using checkboxes for multiple correct options

QUESTION
I'm creating a slide where there is more than one correct answer.  How can I create "check all that apply" without creating multiple choices answers with all combinations?

ANSWER
If you are creating a test using the slide design tool:While editing the text of a multiple choice answer, look on the right side of the screen underneath the text editor.  You can click on the checkboxes and define multiple correct answers which must all be checked in order for the problem to be scored as correct.

If you are creating a test using the standard multiple choice / short answer design tool:Check the "Expand" checkbox to the left of the top buttons.  Each answer now has a checkbox you can check in order to denote a correct answer.  Use the "Preview" button for a question to see exactly how it will appear.