Relative to ground determine the voltages VA VB VC and VD fo

Relative to ground, determine the voltages V_A; V_B; V_C; and V_D for the diagram below. Select your answer to the following question and in your words, explain why you rejected one of the choices (All the points are based on your explanation and none for the right answer). Voltage sources in (parallel/series) add. Current sources in (parallel/series) add.

Circuit is open so no current flows.

The voltages Va,Vb,Vc are zero volts