Find W₁₂ , the work done by the gas as it expands from state 1 to state 2. Express the work done in terms of P₀ and V₀.

a. W₁₂ = P₀V₀
b. W₁₂ = P₀/V₀
c. W₁₂ = P₀-V₀
d. W₁₂ = PV