Which one of the following is supposed to be the connecting link between angiosperms and gymnosperms?

The Gnetales group of gymnosperms includes the genera Gnetum, Welwitschia, and Ephedra. They are thought to be the most primitive group of gymnosperms because they share characteristics with angiosperms such as vessel elements in the xylem and double fertilisation, implying that they are a link between gymnosperms and angiosperms and are important for understanding the evolution of seed plants.