(Combinational versus Sequential Circuit Design) Which of the following contain circuits that are likely to be combinational and which contain sequential circuits? Explain your rationale.

a) A digital alarm that clock that generates an alarm when a present time has been reached.

b) A circuit that turns on or off the classroom light based on the configuration of two input switches. If both switches are in the same position, the light is off. If they are in different positions the light is on.