Question: What needs to be added to this circuit to help control which flip - flop will be changed on the next active clock pulse? A

What needs to be added to this circuit to help control which flip-flop will be
changed on the next active clock pulse?
A data bus to carry the data to the desired flip-flop for storage, and prevent
the data from reaching the others
A set of enable gates (AND gates) to enable the data to reach the correct
flip-flop and prevent it from reaching the others
An address input which would be used to enable the desired flip-flop for
storage while also disabling the others
A demultiplexer to route data to the desired flip-flop for storage and prevent
the data from reaching the others
A multiplexer to select the desired flip-flop for storage, while deselecting the
others
 What needs to be added to this circuit to help control

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