Each of the following statements is true or false. Which statements are true? A. A triangle where at least two angles are acute is called an acute triangle. B. Some polygons are neither convex nor concave. C. The sum of the interior angles of a concave pentagon is $540^{\circ}.$ D. The interior angles of a regular $1000$-gon are greater than the interior angles of a regular $100$-gon. E. The exterior angles of a regular $1000$-gon are greater than the exterior angles of a regular $100$-gon