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

Select one:

a$.$ is tangent to the minimum point of each possible short$-$run average total cost curves.

b$.$ is 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.