"Choose all that apply" : can only one answer be right?

Hi, 

In the PSPO I,I struggled to choose an answer(s) on a question because of its formulation: 

..."(choose all that apply) :

multiple answer checkbox : A
multiple answer checkbox : B
multiple answer checkbox : C 
multiple answer checkbox : D
multiple answer checkbox : E"

Here, I understand it will have to choose more than one answer because of: 

- choose all that apply
- the multiple answer checkbox (when there is only one possible answer, there is another kind of checkbox).