Which option describes what a switch does after it items that a host has connected to a switch port?

Flooding is performed when the destination MAC is unknown, not during the learning process triggered by a new host connection, and flooding goes to all ports in the VLAN - not exclusively trunk ports.

The MAC address learning process is fundamental to switch operation: when a frame arrives on a port, the switch inspects the source MAC address field and writes a MAC-to-port mapping into the CAM (Content Addressable Memory) table. This entry allows the switch to make forwarding decisions for future frames destined to that MAC address without flooding.

Flooding applies to all ports in the VLAN (excluding the ingress port) when the destination is unknown; restricting floods to only access ports is not how standard switch flooding works.

A switch does not discard frames simply because a new host has connected; discarding occurs due to filtering rules such as port security violations or ACLs, not normal host detection.