Which of the following is correct statement ?

Question

$(a)\;Beta\;rays\;are\;same\;as\;cathod\;rays\qquad(b)\;Gamma\;rays\;are\;high\;energy\;neutrons\qquad(c)\;Alpha\;particles\;are\;singly\;ionized\;helium\;atoms\qquad(d)\;proton\;and\;neutrons\;have\;exactly\;same\;mass$