Correct Answer:
Explanation/Reference:
With device channels in SharePoint 2013, you can render a single publishing site in multiple ways by using different designs that target different devices.
A device channel is part of the SharePoint 2013 publishing infrastructure that enables you to render certain site content, style your content, and even change images—while maintaining the same URL across a pool of different devices.
Note: When a user browses a SharePoint site from a mobile device such as a smartphone or tablet, the mobile browser submits to the site an HTTP GET request that includes a user agent string. This string contains information about the type of device that is trying to access the site. Based on that device substring, the device browser can be redirected to a specific master page view.
Scenario: It is essential that the new intranet supports a wide variety of mobile devices, platforms, and browsers. Reference: SharePoint 2013 Design Manager device channels