A type of sequence detector can be used to detect the start frame of a certain secret message. As a designer, you are required to design a Mealy synchronous sequential machine for this sequence detector that will generate an output Z whenever the sequence 1001 is detected on a serial data input line X. Overlapping sequences are considered valid. Obtain the State Diagram for the design. Design the sequence detector circuit using D flip-flops. (a) (b)