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A
Leave it on the doorstep without a signature
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B
Follow your delivery procedures — attempt delivery, ring the bell, and if required leave a notice; do not leave packages requiring signatures without obtaining one
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C
Give it to the neighbor making the request
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D
Return to the station without attempting delivery
Why this is the answer
Proper delivery procedures must be followed regardless of third-party requests. If a signature is required, you must attempt delivery directly to the addressee or authorized recipient. Handing packages to neighbors without authorization violates delivery procedures and the addressee's privacy. Leave a delivery notice with pickup/redelivery instructions.
Source: USPS 474 VEA, Delivery Procedures