Is the density f(y; θ) = θ y for y > θ a member of the exponential family?

• A. Yes, it is a standard member of the exponential family.
• B. No, the domain cannot depend on θ and thus it is not in the exponential family.
• C. Yes, if θ is treated as a natural parameter.
• D. No, only when θ is fixed.

Answer: (B)