Final answer:
The first step in configuring a WLAN using the WLC GUI is to assign a profile name in the Profile Name field. Subsequent steps include setting the SSID, VLAN ID, and LAN type.
Step-by-step explanation:
When configuring a normal WLAN using the WLC (Wireless LAN Controller) GUI, the action you are most likely to perform first is b. Assign a profile name of up to 32 characters in the Profile Name field. This is typically the starting point for creating a new WLAN profile, as it identifies the configuration specific to the WLAN you are creating. An SSID (Service Set Identifier) such as 'MyCompanyLAN' will indeed be assigned, but this usually comes after setting the profile name. Additionally, assigning a VLAN ID and selecting a LAN type (such as Guest LAN) will also be necessary, but these steps come after the initial profile naming.