If ∑n=0∞rn=4\sum_{n=0}^{\infty} r^n = 4∑n=0∞rn=4, what is ∑n=0∞(r2)n\sum_{n=0}^{\infty} (r^2)^n∑n=0∞(r2)n?
16/7
12/7
16/9
4/3