What Happens Once the Full House and Senate Have Each

What happens once the full House and Senate have each passed a version of a bill?

A) If the House and Senate versions are substantially similar, the Senate version goes to the president for his signature or veto.
B) The two versions of the bill go back to the applicable subcommittees in both the House and Senate to reconcile the differences and create a single version for signature or veto by the president.
C) The House and Senate versions are both sent to the president for signature or veto of the version he finds best suited to meeting the needs of the country.
D) Both the House and Senate versions are sent to a Senate-House Conference Committee for reconciliation and then a single version is returned to the full House and Senate for a vote.