If an autonomous AP provides a single SSID and carries client data plus management traffic, which wired port type is required?

A trunk port is required because it can carry multiple VLANs. In this scenario, the autonomous AP is handling both client data (which would typically be on a client VLAN) and management traffic (which would be on a management VLAN). A trunk port allows both these VLANs to traverse the same physical link to the switch. An access port is incorrect because it only carries traffic for a single VLAN. A default port is not a standard port type in this context. LAG (Link Aggregation Group) is used for bundling multiple physical links for increased bandwidth and redundancy, not for carrying multiple VLANs on a single link.