An access point is the best choice in this scenario because it allows laptops, smartphones, and VoIP phones to connect to the wireless network in the expanded office area. While a repeater also extends the range of a wireless network, it may not provide the same level of performance or support for multiple devices compared to an access point. A bridge is typically used to connect two separate networks rather than extending the range of a single network. A media converter is inappropriate for this scenario as it converts data from one type of media to another, such as from fiber to Ethernet, rather than extending wireless coverage.