What is the third partial sum S3S_3S3 for the series ∑n=1∞1n2\sum_{n=1}^{\infty} \frac{1}{n^2}∑n=1∞n21?
11+12+13\frac{1}{1} + \frac{1}{2} + \frac{1}{3}11+21+31
1+14+191 + \frac{1}{4} + \frac{1}{9}1+41+91
1+14+181 + \frac{1}{4} + \frac{1}{8}1+41+81
19\frac{1}{9}91