A cut in frame of a door to receive the shutter, is called A. Louver B. Stop C. Horn D. Rebate

The correct answer is: D. Rebate

A rebate is a cut in the frame of a door to receive the shutter. It is a groove or channel that is cut into the edge of a piece of wood, metal, or other material to receive another piece of material. In the case of a door, the rebate is cut into the frame to receive the shutter, which is a movable panel that covers the opening of the door. The rebate helps to keep the shutter in place and prevents it from rattling or moving around.

The other options are incorrect because:

• A louver is a series of parallel slats or blades that are
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  arranged so that they can be opened or closed to control the flow of air or light.
• A stop is a piece of wood or metal that is used to prevent something from moving or falling.
• A horn is a projecting piece of metal or wood that is used to strengthen or reinforce a structure.