Why Might Successful Brick-And-Mortar Firms Want to Use Different Brand

Why might successful brick-and-mortar firms want to use different brand names online and offline?

A) to avoid harming the brand's name by associating it with a risky product or channel
B) to avoid inadvertently repositioning the offline brand due to a success on the Internet
C) to position differently the online and offline brands
D) all of the above