Which CLI command do you use on Cisco IOS XE Software to put the AP named Floor1_AP1 back in the default AP group?

A.
ap Floor1_AP1 ap-groupname default-group

B.
ap name Floor1_AP1 apgroup default-group

C.
ap name Floor1_AP1 ap-groupname default-group

D.
ap name Floor1_AP1 ap-groupname default

Explanation:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3.2_0_se/multibook/configuration_guide/
b_multibook_config_guide_wireless_3850_chapter_0110.html