If A = {x : x is a multiple of 7},B = {x : x is a multiple of 5} andC = {x : x is a multiple of 35}Then which of the following is null set?

• A. (A – B) ∪ C
• B. (A – B) – C
• C. (A ∩ B) ∩ C
• D. (A ∩ B) – C