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"Confidential" and "Personal" notations should be typed directly below the return address on an envelope. This placement ensures that the notations are clearly visible to the recipient and postal workers. Options A, B, and C are incorrect because they are either not in a prominent enough location or may be covered by the postage stamp or postal barcodes. These notations should also not be placed in the middle of the envelope or in the address block, as they could be easily overlooked or mistaken as part of the address. Therefore, D is the best option for including notations on an envelope.