Consider the following code: Initial begin clock = 1'b0; repeat (30) # 10 clock = -clock end The total duration of this code is expected to be ? Select one: O a. 30 time steps. O b. 50 time step. O . None of the given O d. 300 time step. O e. 60 time steps. Externally, an input port must always be connected to a Select one: O a. net-reg type O b. None of the above O c either wire or reg O d. wire only e. a reg only