Dear All,
I repeat about Option 1: Use the same URL and change the content of the page (breadcrumbs and menus) based on the referral path. Kind of cloaking.
Changing content based on the referral path means that the same url will have different content at times. Which means that the search engine will probably find a different content on the page than some other views of the page. As far as I know, this is cloaking - please correct me if I'm wrong.
Option 4 will not necessarily achieve the desired effect as the search engine might decide to ignore the tag. i checked a few examples that this is actually what happens when other e-commerce stores use canonical - you find both URLs in the serps. So I doubt this is the perfect solution...
I'm still not convinced that I have a definitive answer for this. Anyone?
Thanks!