A system bus connects the primary components of a computer system and includes three main elements the address bus, data bus, and control bus. Statement I: Address bus carries signals relating to addresses between the processor and memory. An address bus that specifies a physical address. The CPU uses the address bus to convey the address of a memory location or an input/output port that needs to be accessed. The number of lines on an address bus determines the maximum number of memory locations that can be accessed in a system. An address bus is a computer bus designed for transferring data between the processor and memory. Thus, Statement I is True. Statement II: It is bi-directional. The address bus is a set of wires that connects the CPU to the main memory and is used to identify addresses in the main memory. Data flows in only one direction from the CPU to the memory or from the microprocessor to the input/output devices. It is uni-directional. ?So, Statement II is false. Therefore, Statement I is true but Statement II is false. Additional Information An address bus with n lines can be addressed directly at a maximum of 2n places. For example, a 16-bit address bus can access two 16-bit or 64-kilobytes of memory. Regardless of whether it's a read or write operation the CPU calculates the address of the required data and passes it to the data bus for execution.