$\begin{array}{1 1} \text{(a) A point mass, whether at rest or in uniform motion, accompanied by matter waves.} \\ \text{(b) Only a charged particle at rest is cannot be accompanied by matter waves.} \\ \text{(c) Only an accelerated charged particle is accompanied by matter waves.} \\ \text{(d) A moving particle, whether charged or uncharged, is always accompanied by matter waves.} \end{array}$
