Consider the following counter circuit: Dy D₂ D₁ MSB CLK- LSB What are the unused states (the states which are not in the main loop) of the counter? Assume initial state of the register is 000. (a) 111 and 011 (b) 110 and 100 (c) 010 and 101 (d) 001, 110 and 111 Consider an LTI system with frequenc x[n] = Σ 6[n−3k].The output to this k=-00 value of He✓✓ for k=4.