The wave nature of the particle results in a single energy being allowed dependent upon how they are restricted.

They are particles and thus can have any energy, with sufficiently high energies allowing them to move unrestricted.

They are particles and thus can have any energy.

The wave nature of the particle results in a lowest energy being allowed dependent upon how they are restricted, with multiple discrete energies allowed above this lowest energy, with a high enough energy resulting in the particle becoming unrestricted.

The wave nature of the particle results in a lowest energy being allowed dependent upon how they are restricted, with any energy above this allowed.