What Is True About the Option Create Mask in Smb

What is true about the option create mask in smb.conf ?

A) Each permission bit that is set (1) create mask cannot be set on a file created by Samba even if the client requests it to be set. Each permission bit that is set (1) create mask cannot be set on a file created by Samba even if the client requests it to be set.
B) Each permission bit that is cleared (0) in create mask is only set on a file created by Samba if the client explicitly sets the bit. Each permission bit that is cleared (0) in is only set on a file created by Samba if the client explicitly sets the bit.
C) each permission bit that is set (1) in create mask is always set on a file created by Samba regardless of the permissions set by the client. each permission bit that is set (1) in is always set on a file created by Samba regardless of the permissions set by the client.
D) Each permission bit that is cleared (0) in create mask is always cleared on a file created by Samba even if the client explicitly sets the bit. is always cleared on a file created by Samba even if the client explicitly sets the bit.