Prototype test data for a hand-crank generator model show several trade-offs. The team should first screen for cost, mass, and minimum output, then choose the highest scoring valid option. Limits: cost ≤ $18, mass ≤ 220 g, score ≥ 7. Test evidence: - Prototype 1: cost $13, mass 180 g, output score 6.2 - Prototype 2: cost $17, mass 205 g, output score 7.4 - Prototype 3: cost $16, mass 195 g, output score 8.2 - Prototype 4: cost $22, mass 210 g, output score 9 Which design is optimized?