(a) ( 12% ) Fill out the missing voltages (indicated with arrows) in the pass transistor circuit below. You may use Vtn (>0) or Vtp (<0) for the NMOS or PMOS threshold voltage if needed. (b) (13%) Pass transistors can be used to build logic gates, also known as pass transistor logic. Are they restoring or non-restoring logic? Identify the logic expressions of U, V, X, Y in the following schematics.