Which statement about I2C is true?

• A. It uses a unique address for each device on the bus
• B. It uses separate data lines for each device
• C. It requires a clock line per device
• D. It cannot support more than two devices

Answer: (A)

On an I2C bus, devices share just two wires: SDA for data and SCL for the clock. Each device has a unique address, so the master can target a specific device on the same two-wire network. Communication starts with the master sending a start condition, then the device address plus a read/write bit; the addressed device acknowledges, and data is exchanged over the shared data line under the control of the shared clock. This design lets many devices coexist on the same bus, limited by address space and bus electrical characteristics. The idea of a separate data line per device, a clock line per device, or a hard limit to only two devices does not fit how I2C is wired.