If A = {x:x is a multiple of 7}, B = {...

If A = {x:x is a multiple of 7},
B = {x:x is a multiple of 5} and
C = {x:x is a multiple of 35}, then which one of the following is a null set ?

A

`(A - B) uu C`

B

`(A - B) - C`

C

`(A nn B) nn C`

D

`(A nn B) - C`

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