The graph of f', the derivative of the continuous function f, is shown above on the interval -8

The graph of the derivative ofthe continuous function f, is showqabove on the interval 8 < C < 7. Ille graph of has horizontal tangent lines at C = 6, C = 3, C = 2, and C = 6.3, anda vertical tangent line at x = 4. On which intervals is the graph of both increasing and concave down? 8.