20 POINTS Which of the following statements is true of subroutines? Check all that apply. They can be used in multiple places.

They can be used in one place only.

They save a programmer time since they are reusable.

They can be used only once.

They can contribute to excessive use of a computer’s resources.

Asequential circuit contains a register of four flip-flops. initially a binary number n (0000 ≤ n ≤ 1100) is stored in the flip-flops. after a single clock pulse is applied to the circuit, the register should contain n + 0011. in other words, the function of the sequential circuit is to add 3 to the contents of a 4-bit register. design and implement this circuit using j-k flip-flops.