Which has EEE-Z Z\,Z isomers?
C2H4F2\text{C}_2\text{H}_4\text{F}_2C2H4F2
C2H2F2\text{C}_2\text{H}_2\text{F}_2C2H2F2
C2H3F\text{C}_2\text{H}_3\text{F}C2H3F
C2H5F\text{C}_2\text{H}_5\text{F}C2H5F