What is the value of \(\frac{1}{{\sqrt 3 + \sqrt 4 }} + \frac{1}{{\sqrt 4 + \sqrt 5 }} + \frac{1}{{\sqrt 5 + \sqrt 6 }} + \frac{1}{{\sqrt 6 + \sqrt 7 }} \).
1
\(\sqrt 8 - \sqrt 5\)
2
\(\sqrt 3 - \sqrt 7\)
3
\(\sqrt 6 - \sqrt 5\)
4
\(\sqrt 7 - \sqrt 3 \)