Final answer:
An Ethernet cable, likely either Cat5e or Cat6, is most commonly used to connect a printer directly to a network for access by local staff.
Step-by-step explanation:
The type of network cable most likely used to connect a printer directly to the network and make it accessible to all staff in the vicinity is an Ethernet cable. This common cabling standard is widely used in local area networks (LANs) and can suffice for both network connectivity and communication purposes. In most office settings, Category 5e (Cat5e) or Category 6 (Cat6) cables are typically utilized, providing a stable and reliable connection for devices like printers.
However, it's important to note that printers also come with wireless capabilities, which might be considered depending on the network setup of an office. For offices with a wired network infrastructure, using an Ethernet cable is the standard way to ensure all staff members can access the network printer.