Answer:
b.
Step-by-step explanation:
The graph can be divided into 4 regions.
Region 1 is for ![x\in (-\infty,-1)](https://tex.z-dn.net/?f=x%5Cin%20%28-%5Cinfty%2C-1%29)
Region 2 is for ![x\in (-1,0)](https://tex.z-dn.net/?f=x%5Cin%20%28-1%2C0%29)
Region 3 is for ![x\in (0,1)](https://tex.z-dn.net/?f=x%5Cin%20%280%2C1%29)
Region 4 is for ![x\in (1,\infty)](https://tex.z-dn.net/?f=x%5Cin%20%281%2C%5Cinfty%29)
So, for the region 1, the values of
goes on decreasing with increasing
. Therefore, the function is decreasing in the interval
.
Now, for the region 2, the values of
increases with increasing
. So, the function is increasing in the interval
.
For the region 3, the the values of
goes on decreasing with increasing
. Therefore, the function is decreasing in the interval
.
Now, for the region 4, the values of
increases with increasing
. So, the function is increasing in the interval
.
Therefore, regions 2 and 4 are the regions when the function is increasing.
Hence, the correct option is b.