Option 3: Colonize Mars. This is by far the most expensive, dangerous and time-consuming option, because over 500 people (250 men and 250 women) would have to go in rapid succession in order to prevent inbreeding. However, its opportunities for both scientific research and economic benefit are practically unlimited.
since we dont have any problem freezing embryos, inbreeding would not be a problem, as we could just take a large and diverse genetic stock with us. by the time we have the technology to economically colonise ET planets, we should be able to raise proper test-tube babies, so we could even do without the small army of surrogate mums needed to propagate the embryos.
however, my guess is there would be problems with embryo development on ET planets because we havent evolved under their conditions, so for our local planets just sending at least adolescent age colonists would be the best solution. gravity would be the major problem for Mars, different radiation spectra might also have unexpected effects.
Also remember that someone who has grown up on Mars will never be able to visit earth, and for long term colonists it would also be a one-way trip.