Add: \(\frac{1}{2} + \frac{1}{6} + \frac{1}{{12}} + \frac{1}{{20}} + \frac{1}{{30}} + \frac{1}{{42}}\)

• A. 19 / 21
• B. 6 / 7
• C. 5 / 7
• D. 16 / 21