In what activity of Continuous Exploration are Features prioritized in the ART Backlog?

According to the SAFe DevOps Practitioner 6.0 study guide and handbook, Features are prioritized in the ART Backlog in the Synthesize activity of Continuous Exploration. This activity involves creating Solution hypotheses based on customer needs and market research, and then selecting the most promising ones to be implemented in the ART Backlog. The handbook states that "Synthesize is the activity of creating Solution hypotheses based on customer needs and market research, and then selecting the most promising ones to be implemented in the ART Backlog."1 Therefore, Synthesize is where Features are prioritized for continuous delivery.