Final answer:
HD 209458-b is the largest exoplanet, with 70% the mass of Jupiter and 35% larger radius. It is classified as a gas and liquid world.
Step-by-step explanation:
The largest exoplanet among the given options is HD 209458-b. This determination is based on the measurements obtained using the Doppler and transit techniques. Doppler measurements revealed that HD 209458-b has about 70% the mass of Jupiter, while transit measurements showed that its radius is about 35% larger than Jupiter's. Based on these measurements, HD 209458-b is classified as a gas and liquid world, similar to Jupiter or Saturn.