Which mechanism between a wireless LAN controller and a Layer 2 switch provides redundancy, higher bandwidth, and load sharing?

Link aggregation (LAG), also known as EtherChannel, combines multiple physical links into a single logical link. This provides redundancy because if one physical link fails, traffic can still flow over the remaining links. It also increases bandwidth by allowing traffic to be distributed across all active links, and enables load sharing by distributing traffic among the aggregated links. First hop redundancy protocols (FHRPs) like HSRP or VRRP provide gateway redundancy, not link redundancy or bandwidth aggregation. VLAN trunking allows multiple VLANs to traverse a single link, but it doesn't inherently offer redundancy, increased bandwidth, or load sharing for the link itself. Tunneling encapsulates one protocol within another, which is not primarily for link redundancy or bandwidth aggregation between these specific devices.