What is true about the Samba configuration options create mask?

What is true about the Samba configuration options create mask?
A . Each permission bit that is set (1) in 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.
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.
D . Each permission bit that is cleared (0) in create mask is always cleared on a file created by Samba even if the client explicit sets the bit.

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Answer: D