While David is widely known as a king, a warrior, and a musician, what was David's profession before he was called to serve in Saul's court and eventually become king?

A A tax collector in the city of Bethlehem, known for his fairness. B A skilled craftsman who built chariots for the Philistine army. C A shepherd, tending his father's flock in the fields near Bethlehem. D A prophet, delivering messages from God to the people of Israel.