What would be the state of shift register C in the figure be

What would be the state of shift register C in the figure below after 2 correct code digits are entered for the entry code 4739?

Solution

From the figure here keyboard encoder gives the input to shift register A,logic input to shift register B with respect to CLK pulse state of one-shot A,one shot B to shift register C,here the entry code of 4739,after two correct code digits are entered the shift register C state is as

The state of shift registers A and C after two correct key closures are

shift register A : 1001

shift register C : 00000100