Nikon D780 DSLR Camera (Body Only) - Manual (Page 245)

199 Shooting Settings
A The [White Balance] Option
White balance can also be adjusted via the [ White Balance ] item in the
photo and movie shooting menus.
A D ([Natural Light Auto])
D ([ Natural light auto ]) may not produce the desired results under
artificial light. Choose 4 ([ Auto ]) or an option that matches the light
source.