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What are all the constraints on s(n). u(n), and t(n) if t is a polynomial-time reducer? what are the constraints on feasibility, even if the reduction is not polynomial-time? after working out these constraints, identify the true statement from the list below. a) s(n) = n^2; u(n) = n^3; t(n) = n4 is possible, but not a polynomial-time reduction. b) s(n) = n^2; u(n) = n^2; t(n) = n! is possible, but not a polynomial-time reduction. c) s(n) = log n: u(n) = n; t(n) = n^2 is not physically possible. d) s(n) = log n; u(n) = n: t(n) = n^2 is possible, but not a polynomial-time reduction.

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