Question: What is the name of the youngest coordinator in the NFL who is the head coach and general manager of the San Francisco 49ers in their 68th season in the National Football League?
Sentence (from "2017 San Francisco 49ers season"): The 49ers will look to improve on their 2–14 record from the 2016 season and attempt to clinch their first playoff berth since 2013.
Relevant evidence: No