An unknown plant species has separate male and female gametophytes, and releases spores into the environment. Which of the following is the most logical conclusion about the life cycle of this plant?

The plant is a fern, and the gametophyte is its dominant phase.
The plant is a gymnosperm, and the sporophyte is its dominant phase.
The plant is a moss, and the gametophyte is its dominant phase.
The plant is an angiosperm, and the sporophyte is its dominant phase.