In the given figure, Point $\mathrm{O}$ indicates the stress point of a soil element at initial non-hydrostatic stress condition. For the stress path $\text{(OP),}$ which of the following loading conditions is correct?
- $\sigma_v$ is increasing and $\sigma_h$ is constant
- $\sigma_v$ is constant and $\sigma_h$ is increasing
- $\sigma_v$ is increasing and $\sigma_h$ is decreasing
- $\sigma_v$ is decreasing and $\sigma_h$ is increasing