Which of the Following Statements About the Parallel Distributed Processing

Which of the following statements about the parallel distributed processing approach is correct?

A) When one unit is stimulated, all the units that are connected with it are simultaneously inhibited.
B) When one unit is stimulated, all the other units are automatically given a default assignment.
C) When one unit reaches an appropriate activation level, it can either inhibit or excite other units to which it is connected.
D) At any given time, numerous serial operations are proceeding at the same time through several portions of the cortex.