Suppose some function ()f(x) is concave up throughout the interval 0<<20

Select one:

a.

The function ()f(x) is a nonlinear function.

b.

For any 1x1 and 2x2 in the interval [0,2][0,2], the secant line between the points (1,(1))(x1,f(x1)) and (2,(2))(x2,f(x2)) lies above the graph =()y=f(x).

c.The average rate of change of ()f(x) from =0x=0 to =1x=1 is strictly less than the average rate of change from =1x=1 to =2x=2.

d.

The average rate of change of ()f(x) is increasing on the interval (0,2)(0,2).

e.

The function is increasing on the interval (0,2)(0,2).