What logo should be placed on the subdomain with IM?

Question

Design

There is an information and news site. It will host an online store with its own engine and database on its subdomain. How is it generally accepted where to place the logo and a link to the main site from such a subdomain? On the one hand, it is necessary that people do not get confused and do not jump out periodically to the main site, thinking that they are going to the main page of the store. On the other hand, it is probably desirable for them to constantly gently remind that the store is part of the main site and here they can go to it.
Can you show good solutions in your opinion on the network?

Answer 1

In this site, with the top bar and is a good solution.