If you are applying for co-op permit, it's not specified for co-op work permit. Just choose to be exempted from LMO, job offer and fee payment. And keep saying you are applying for co-op work permit. At the end, just to upload the co-op letter from your co-op office to be the proof for all exemptions.
Throughout this series, we refer to links where you can find more information about the topic being discussed. You can find all of these links, organized by segment, by referring to the Related links page - open it in a separate tab or window and follow along as you watch each video.