Which of the following correctly represents integrated rate law equation for a first order reaction in gas phase?

O ck=2.303/t x log₁₀ Pᵢ/Pᵢ-P
O k=2.303/t x log₁₀ Pᵢ/2Pᵢ-P
O k=2.303/t x log₁₀ 2Pᵢ/Pᵢ-P
O k=2.303/t x log₁₀ Pᵢ/2Pᵢ