Lets start with an Example , in a software development project

-> Coding is an Discreat Effort, the effort needed to create the deliverable

- Aportioned effort is and effort needed to verify deliverable , so testing is an apportionate effort, the effort we spend in ensuring that discreat effort is producing the right output

- LOE is not directly contributing to the deliverable but it is necessary so that discreate and apportionate effort can product output, so the project management activities falls under this category 

 What's the source of this question, don't see anything like this in PMBOK