What is the correct description about the Gaussian distribution curve?

What is the correct description about the Gaussian distribution curve?
A . The Gaussian curve is bell-shaped, with both ends high and the middle low
B . The smaller the standard deviation, the flatter the curve
C . The larger the standard deviation, the thinner and taller the curve
D . The Gaussian curve is bell-shaped, with both ends low and the middle high

Answer: D