Device physical addresses, such as MAC (Media Access Control) addresses, are represented in hexadecimal format. A typical MAC address looks like 00:1A:2B:3C:4D:5E, using base-16 values (0-9 and A-F). "MAC addresses are 48-bit identifiers assigned to network interfaces, commonly displayed in hexadecimal format." - CompTIA ITF+ Networking Fundamentals Correct answer: A