A machine should operate based on the status of input signals from the sensors A, B, C and D as shown in the table. 'x' represents "don't care" in the truth table. Design a logic system for starting. Use the method of Product of sums to formulate the logic expression. Only NOR gates can be used. sumsg Sketch the logic circuit after simplification. \ [20] A B C D START A B C D START 0 | 0 0 0 1 1 000 X 000 1 0 1 0 0 0 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 1 1 0 0 X 1 0 0 0 0 0 0 0 1 1 10 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 0 0 1 1