JEE Math Practice Question

The coefficient of the middle term in the binomial expansion in powers of $$x$$ of $${\left( {1 + \alpha x} \right)^4}$$ and $${\left( {1 - \alpha x} \right)^6}$$ is the same if $$\alpha $$ equals

1. A.$${3 \over 5}$$
2. B.$${10 \over 3}$$
3. C.$${{ - 3} \over {10}}$$
4. D.$${{ - 5} \over {3}}$$