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The most suitable cable type for connecting a scanner to a computer is a USB cable. USB (Universal Serial Bus) cables are designed for connecting a wide range of peripheral devices, including scanners, to computers. They allow for both power and data transfer between devices, making them ideal for scanning documents and images directly to a computer.

Scanners typically use USB connections due to their speed and convenience, as well as widespread compatibility across different operating systems and devices. USB cables are easy to use, requiring only a simple plug-and-play setup that most users find straightforward.

LAN cables, on the other hand, are used primarily for networking and connecting devices to a local area network, which does not apply to the direct connection of a scanner to a computer. HDMI cables are intended for transmitting high-definition video and audio signals, making them suitable for connecting devices like monitors and televisions but not for scanners. Audio cables carry audio signals and have no functionality related to the data transfer or communication requirements of scanners.