For a Typical Firm, the Long-Run Average Total Cost Curve

For a typical firm, the long-run average total cost curve:

A) is a tangent to the minimum point of each possible short-run average total cost curve.
B) is a tangent to each possible short-run average total cost curve at one point.
C) intersects each possible short-run average total cost curve at two points.
D) passes through the minimum points of all possible short-run average total cost curves.