Under AC 21.17-4, what is the primary certification function the document serves for early powered-lift eVTOL programs? Group of answer choices It grants automatic mutual recognition of type certificates among NAA Network signatories for powered-lift designs. It creates a new binding regulation that replaces all special conditions for powered-lift aircraft across Parts 23/27/29. It issues mandatory production approvals for electric propulsion systems used in AAM aircraft without further testing. It provides acceptable airworthiness criteria and means of compliance under 21.17(b) for powered-lift, covering areas like system safety, structures, flight performance, propulsion, and software