What characteristic best describes a KVM switch?

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Question:
What characteristic best describes a KVM switch?

a device that allows the use of one set of keyboard, mouse, and monitor to control multiple computers
an input device often used to provide secure access to locations or devices by using voice, facial, or fingerprint recognition
an input device allowing users to pay for a product by tapping their credit card or smartphone on another device
an input device that reads barcodes affixed to most retail products