How does a presidential veto affect a bill passed by congress?

it passes a bill approved by congress and becomes law as soon as the supreme court rules it to be constitutional.

it changes a bill passed by congress to suit the president, who will send it back to congress to pass or reject with a simple majority vote.

it delays a bill passed by congress from becoming law for one full year, after which the president must sign the bill into law.

it kills a bill passed by congress unless congress votes to override the veto with a two-thirds majority in each house.