Let $R$ be the relation in the set $N$ given by $R=\{(a,b): a=b-2, b>6\}$. Choose the correct answer:

Question

\[\; (2,4) \in R\qquad  \;(3,8)\in R\qquad \;(6,8) \in R\qquad  \;(8,7) \in R\qquad\]