The intensity distribution of `X` - rays from two Coolidge tubes operated on different voltages `V_(1)` and `V_(2)` and using is shown in the figure . Which one of the following inequalities is true ?
A. `V gt V,Z lt Z`
B. `V gt V gt Z gt Z`
C. `V lt V, Z gt Z`
D. `V = Z,Z lt Z`