Dẫn xuất halogen nào sau đây có đồng phân hình học?

$\text{C}\text{H}{}_2=\text{C}\text{H}\text{C}\text{l}$.

$\text{C}\text{H}{}_2=\text{C}\text{H}-\text{C}\text{H}{}_2\text{B}\text{r}$.

$\text{C}\text{H}{}_3\text{C}\text{H}=\text{C}\text{F}\text{C}\text{H}{}_3$.

$\left(\text{C}\text{H}{}_3\right){}_2\text{C}=\text{C}\text{H}\text{I}$.