Why is it important that you maintain one unfiltered view when using filters with your Analytics account?

Online Marketing Tipz
Why is it important that you maintain one unfiltered view when using filters with your Analytics account?

A)  Without one unfiltered view, you will not be able to use a filter for multiple views
B)  An unfiltered view ensures that the original data can always be accessed
C)  There is no reason to maintain an unfiltered view
D)  You will need to configure your goals in the unfiltered view

Answer: B