Two $\text{D}$-flip-flops, as shown below, are to be connected as a synchronous counter that goes through the following $\mathrm{Q}_{1} \mathrm{Q}_{0}$ sequence $00 \longrightarrow 01 \longrightarrow 11 \longrightarrow 10 \longrightarrow 00 \longrightarrow \dots$
The inputs $D_{0}$ and $D_{1}$ respectively should be connected as
- $\overline{\mathrm{Q}_{1}}$ and $\mathrm{Q}_{0}$
- $\overline{\mathrm{Q}_{0}}$ and $\mathrm{Q}_{1}$
- $\overline{\mathrm{Q}_{1}} \mathrm{Q}_{0}$ and $\overline{\mathrm{Q}_{1}} \mathrm{Q}_{0}$
- $\overline{\mathrm{Q}_{1}} \; \overline{\mathrm{Q}_{0}}$ and $\mathrm{Q}_{1} \mathrm{Q}_{0}$