In the question below, a statement is given, followed by two assumptions numbered I and
II. An assumption is something supposed or taken for granted. You must decide which of the assumptions is implicit in the statement. Statement: A national postal service has announced that it will reduce the number of physical post boxes in residential neighborhoods and significantly expand its network of automated, 24/7 digital parcel lockers. Assumptions:
I. A sufficient portion of the residential population is comfortable using digital interfaces and QR codes to manage their mail and packages.
II. The operational cost of maintaining a high density of physical post boxes is higher than the long-term investment in automated locker systems.

Why Assumption I is implicit: This mirrors your "rural customers gaining smartphone access" logic. For a postal service to replace simple post boxes with digital lockers, it must take for granted that the users are technologically capable of interacting with the new system. If the population could not use digital interfaces, the transition would result in a total failure of service delivery. Why Assumption II is implicit: This mirrors your "cost-effective" logic. A large-scale infrastructure shift (removing old assets and installing new high-tech ones) is a strategic business decision. It inherently assumes that the new model (lockers) offers better financial or operational efficiency compared to the traditional model (post boxes), which may be becoming obsolete or too expensive to service manually.