By name or number, identify all of the following three statements that explain why quantum dots sometimes do not continuously emit light despite continous excitation: 1) Energy can be released through the emission of Auger electrons instead of photons 2) Empty nonbonding orbitals at quantum dot surfaces can serve as sinks for the energy and prevent emission 3) The distribution of exciton energies is such that not all decays will lead to emission in the visible spectrum