JEE Math Practice Question

If $${{dy} \over {dx}} + {3 \over {{{\cos }^2}x}}y = {1 \over {{{\cos }^2}x}},\,\,x \in \left( {{{ - \pi } \over 3},{\pi \over 3}} \right)$$ and $$y\left( {{\pi \over 4}} \right) = {4 \over 3},$$ then $$y\left( { - {\pi \over 4}} \right)$$ equals -

1. A.$${1 \over 3} + {e^6}$$
2. B.$${1 \over 3}$$
3. C.$${1 \over 3}$$ + e3
4. D.$$-$$ $${4 \over 3}$$