JEE Math Practice Question

The value of $$\mathop {\lim }\limits_{h \to 0} 2\left\{ {{{\sqrt 3 \sin \left( {{\pi \over 6} + h} \right) - \cos \left( {{\pi \over 6} + h} \right)} \over {\sqrt 3 h\left( {\sqrt 3 \cosh - \sinh } \right)}}} \right\}$$ is :

1. A.$${4 \over 3}$$
2. B.$${2 \over 3}$$
3. C.$${3 \over 4}$$
4. D.$${2 \over {\sqrt 3 }}$$