Which of the following for-loop headers results in equivalent numbers of iterations:
```
A. for (int q = 1; q <= 100; q++)
B. for (int q = 100; q >= 0; q--)
C. for (int q = 99; q > 0; q -= 9)
D. for (int q = 990; q > 0; q -= 90)
```
a. A and B.
b. C and D.
c. A and B have equivalent iterations and C and D have equivalent iterations.
d. None of the loops have equivalent iterations.
b. C and D.
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