Beyond his role as a judge, what unique characteristic defined Ehud's approach to delivering Israel from Moabite oppression, as described in Judges 3?

A He assembled a large army, demonstrating overwhelming military strength. B He used diplomacy and negotiation to peacefully resolve the conflict. C He crafted a double-edged sword and personally assassinated the Moabite king, Eglon. D He relied on divine intervention and miracles to defeat the Moabites.