Correct option is D
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Diagonal cutters are specifically designed for cutting wires, including hard wires. They have sharp, angled jaws that apply concentrated force on the wire, making them the most suitable tool for this purpose.
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Wire strippers: Used to remove insulation from wires, not for cutting hard wires.
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Long nose pliers: Suitable for bending or gripping wires in tight spaces, but not ideal for cutting hard wires.
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Locking pliers: Used for gripping and holding objects securely, not for precise wire cutting.