How does Beowulf's story about the battle with Breca differ from Unferth's version of the story?

ABeowulf says he won the battle by outwitting Breca with logic.

BBeowulf suggests that Breca's swimming abilities hindered his fighting skills.

CBeowulf explains how he won the sword of Breca and shows it to the soldiers in the great hall.

DBeowulf explains that he fought off sea monsters all night, so he couldn't participate in the challenge with Breca.