If u are going to continue working with ur current employer tick the first option, if ur switching to a new employer choose the second option.
If you are applying online then u also need to mention *other* in the "what type of work permit are u applying for? " under the "details of intended work in Canada section. And then write down that ur applying for a bridging open work permit.
If u are mailing in ur application then u might want to write a cover letter informing them that this application is for a bridging open work permit.