Identify the correct statement for change of Gibbs energy for a system `(DeltaG_(system))` at constant temperature and pressure:
A. If `DeltaG_("system") gt 0`, the process is spontaneous
B. If `DeltaG_("system") = 0` the system has attained equilibrium
C. If `DeltaG_("system") = 0`, the system is still moving in a particlular direction
D. If `DeltaG_("system") lt 0`, the process is not spontaneous