The greatest common factors for the choices are $$1$$, $$3$$, $$1$$, $$1$$, respectively. 
Which pair of numbers has a common factor greater than $$1$$? 
a) $$4$$ and $$9$$ 
b) $$6$$ and $$27$$ 
c) $$27$$ and $$50$$ 
d) $$33$$ and $$100$$ 