Select right app model

Hi, I had the following question in my exam.
But I don't which answer is the right one.
Thanks
Stephan
You must select an app model to deploy apps to an Office 365 small business tenant. The business logic of the app is located in a remote web application.
What should you do ?
1.Create a SharePoint-hosted app. Implement the business logic by using JavaScript.
2.Develop provider-hosted apps and integrate data sources with the business logig by using OData.
3.Develop the busniess logic to the host web by using a Full Trust SharePoint solution.
4.Develop an OData service provider infrastructure and publish the provider to the _layouts directory

As I understand,
Since the app logic is in remote web application, you can't access the remote web with js - cross doamin issue.
Possibly the option as it requires less duplication of logic. All you need to do is get data from remote web using odata - business logic will be still in remote web. [Possible answer]
You have your business logic in remote web, you don't want to use full trust to duplicate your business logic.
Too much work.
So the second choice may be the answer. Since the app business logic is already exists in remote web, you should not duplicate the same logic. Instead, using OData, you can get the data inside SharePoint and if needed you can redirect user to remote web
as part of provider hosted app configuration
Thanks,
Sohel Rana
http://ranaictiu-technicalblog.blogspot.com

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(edited my original post..)
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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Wendy Li
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Select right app model

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