Which of the following best compares gnetophyta and ginkgophyta?

a.) they both produce seeds, but gnetophytes are nonvascular and ginkgos are vascular.
b.) they are both vascular, but gnetophytes produce flowers and fruit, and ginkgos do not.
c.) they are both angiosperms, but gnetophytes produce cones and ginkgos produce flowers.
d.) they are both gymnosperms, but ginkgos produce flagellated sperm and gnetophytes do not.