In project finance cash flow modeling, which distribution description is commonly used for revenue, price, and volume, with margins derived from combined distributions?

• A. Revenue: exponential; price: normal; volume: uniform; margins: fixed.
• B. Revenue: lognormal; price: normal; volume: Poisson/beta; margins from a single distribution.
• C. Revenue: lognormal; price: normal; volume: Poisson; margins: independent.
• D. Revenue: lognormal; price: normal; volume: Poisson/beta; margins from combined distributions.

Answer: (D)