Which role in SAFe has content authority over the Agile Team's backlog?

According to the Essential SAFe article on the Scaled Agile Framework website, the Product Owner (PO) is the role in SAFe that has content authority over the Agile Team’s backlog. The article states that “The Product Owner (PO) is the content authority for the team backlog. The PO is responsible for defining stories and prioritizing the backlog.” Therefore, the correct answer is B, Product Owner. The other options are not accurate, as they are not the roles that have content authority over the Agile Team’s backlog. The Release Train Engineer (A) is the servant leader and chief Scrum Master for the Agile Release Train (ART). The Product Management © is the content authority for the program backlog. The Agile Team (D) is the cross-functional group of developers, testers, and other specialists that deliver value in an iteration.