Consider the following statements.
S_{1}: f(x) = x^{5} + 3x - 1 is an increasing function for all values of x.
S_{2}: f(x) = 1-x^{3}-x^{9} is decreasing function for all values of x where x 0.
Which of the above statements are TRUE.
- A-S_{1} only
- B-S_{2} only
- C-Both S_{1} and S_{2}
- D-Neither S_{1} nor S_{2}