Which of the Following Statements Is (Are) TRUE

Which of the following statements is (are) TRUE?

A) Short-run average total cost curves intersect the long-run average total cost curve at its minimum point.
B) It is not possible for two short-run average total cost curves to cross.
C) The long-run average total cost curve is derived by tracing out all of the firm's short-run average total cost curves.
D) The long-run average total cost curve indicates that it is more costly to produce output in the long run, especially when input prices are rising because of inflation.