Identify the correct statement for change of Gibbs energy for a system ($\Delta G_{\text{system}}$) at constant temperature and pressure:

1. A
   If $\Delta G_{\text{system}}>0$, the process is spontaneous
2. B
   If $\Delta G_{\text{system}}=0$, the system has attained equilibrium
3. C
   If $\Delta G_{\text{system}}=0$, the system is still moving in a particular direction
4. D
   If $\Delta G_{\text{system}}<0$, the process is not spontaneous