If A = {1, 2, 3, 4, 5, 6}, B = {1, 2, 3, 5, 7, 9} and C = {3, 5, 6, 7, 8, 9}, what is (A ⋃ B) ⋂ (B ⋃ C)?
a. { }
b. {1, 2, 3, 4, 5, 6, 7, 9}
c. {1, 2, 3, 5, 6, 7, 9}
d. {1, 2, 3, 4, 5, 6, 7, 8, 9}