Which command will set the user.author attribute on the file afile.txt

Which command will set the user.author attribute on the file afile.txt

A.
setfacl user.author:"A.Author" afile.txt

B.
setfacl n user.author v "A.Author" afile.txt

C.
setfacl user.author="A.Author" afile.txt

D.
setfacl a user.author="A.Author" afile.txt