The correct answer is option 1, which states that a fuse wire must be conducting and of low melting point.

A fuse wire is a safety device that is used to protect electrical circuits from overcurrent or short circuits. When there is too much current flowing through a circuit, the fuse wire is designed to melt and break the circuit, thus preventing damage to the equipment or a potential fire.

To effectively perform its function, a fuse wire must be conducting, meaning it allows electric current to flow through it easily. This is essential because the fuse wire needs to carry the excessive current to trigger its melting.

Additionally, the fuse wire must have a low melting point. This is crucial because it allows the wire to melt quickly when there is an overload or short circuit. By melting, the fuse wire interrupts the current flow and opens the circuit, thus protecting the equipment and ensuring safety.

Therefore, an ideal fuse wire should be conducting to allow current flow and have a low melting point to quickly disconnect the circuit when necessary.