Answer:
The best choice for the register FFs will be the "D" type
Step-by-step explanation:
The D type Flip flop, also known as the Disabled flip flop. it is the best choice when transferring data between registers. This is because they help prevent unnecessary interconnections between the two registers by using the "SET" and "RESET" features that they have.
If this data input is held HIGH the Disable flip flop would be “SET” and when it is LOW the flip flop would change and become “RESET”.
This helps to avoid problems and interference when transmitting data between two registers