Which of the following statements are correct

Quantum key distribution (QKD) is a technique that allows two parties to share a secret key with the guarantee of unconditional security, regardless of the computational power of an eavesdropper.

The maximum theoretical distance over which QKD can be implemented is limited by decoherence in the quantum channel and cannot be extend beyond this value.

Quantum key distribution requires the use of a trusted third party.

In QKD the use of wavelength division multiplexing allows for increasing the secure key rate by using multiple channels at different wavelengths.