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A
They are the same thing
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B
Tracking provides real-time scan events along the route; delivery confirmation only confirms final delivery without intermediate scans
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C
Delivery confirmation tracks the entire route; tracking only confirms delivery
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D
Neither provides any real-time information
Why this is the answer
USPS Tracking (included with Priority Mail, Priority Mail Express, and USPS Ground Advantage) provides multiple scan events along the route — accepted at post office, in transit, out for delivery, delivered. Delivery Confirmation (older, now largely replaced) provided only the final delivery scan. Customers frequently ask about tracking — understanding the difference and what their specific service includes is important counter knowledge.
Source: USPS 477 VEA, Tracking Services