At 400 C the Value of K P for the Equilibrium

At 400 C the value of K p for the equilibrium 2 NO (g) + O₂(g) 2 NO₂ (g) is 1.0*10⁶ . What is the value of K p for the equilibrium 2 NO₂ (g) 2 NO (g) + O₂(g) ?

A) 1.0×10 ^{- 6}
B) (1.0×10⁶) (RT) ^{- 1}
C) (1.0×10⁶) (RT) ³
D) 3(1.0×10⁶) /2
E) K _p cannot be determined