Before a three-for-one stock split, the shares outstanding were 5,000 shares at $12 par. After the split, what was the par and number of shares?

A. 5,000 shares at $48 per share
B. 15,000 shares at $12 per share
C. 20,000 shares at $6 per share
D. 15,000 shares at $4 per share