Explanation:

Let's evaluate each statement regarding a computer network: \nStatement (a) **a collection of hardware components and computers**: A computer network fundamentally consists of various hardware components such as computers (servers, workstations, laptops), networking devices (routers, switches, hubs, modems), cables, and wireless access points. These components work together to form the network infrastructure. Therefore, statement (a) is true. \nStatement (b) **inter-connected by communication channels**: The hardware components and computers in a network must be linked together to communicate. This interconnection is achieved through communication channels, which can be wired (e.g., Ethernet cables, fiber optic cables) or wireless (e.g., Wi-Fi, Bluetooth). Therefore, statement (b) is true. \nStatement (c) **used to share resources and information**: The primary purpose and benefit of a computer network are to enable the sharing of resources (such as printers, storage devices, internet access, and software applications) and information (such as files, databases, and messages) among connected users and devices. This enhances collaboration and efficiency. Therefore, statement (c) is true. \nSince all three statements (a), (b), and (c) accurately describe characteristics and functions of a computer network, the correct option is the one that includes all of them. \nLet's analyze the options:\nOption (A) Only (a) is true: Incorrect, as (b) and (c) are also true.\nOption (B) Only (a) and (b) are true: Incorrect, as (c) is also true.\nOption (C) Only (b) and (c) are true: Incorrect, as (a) is also true.\nOption (D) All (a), (b) and (c) are true: This correctly identifies that all three statements are part of the comprehensive definition of a computer network. \nTherefore, the correct option is (D).