Congress passes a bill- The president veto's a bill- congress overrides the presidential veto

Which principle of U.S. government is illustrated in the sequence above?
judicial review
checks and balances
popular sovereignty
federalism
is it a?

2 answers

What judicial bench is involved in this? No, it's not A.
If the bill pass after president veto it, is the vote of congreese called supermajority?