The following questions concern the profits of firm N. The graph of the profits vs. time is given above. For each of the intervals enter the letters corresponding to the descriptions which describe the behavior of the graph on that interval. (The letters in each answer must be in alphabetical order with no spaces between the letters.)
1. The interval from a to b
2. The interval from b to c
3. The interval from c to d
4. The interval from d to e
5. The interval from e to f

A. The firm makes a profit on this interval.
B. The firm registers a loss on this interval.
C. The profit of the firm increases on this interval.
D. The profit of the firm decreases on this interval.
E. Assuming the profits are reinvested in the firm the networth of the company is increasing on this interval.
F. Assuming the profits are reinvested in the firm the networth of the company is decreasing on this interval.