Which of the following pairs of equations best suits this graph?
Cost
2007-15-03-00-00_files/i0210001.jpg
I
Cost
2007-15-03-00-00_files/i0210002.jpg
II
Revenue
2007-15-03-00-00_files/i0210003.jpg
III
Revenue
2007-15-03-00-00_files/i0210004.jpg
IV
a.
I and III
b.
I and IV
c.
II and III
d.
II and IV