The half -life period of a radioactive element A is same as mean life of another radioactive element B . Initially both of them have same number of atoms

Question

$(a)\;x\;and\;y\;have\;same\;decay\;rate\;initially\qquad(b)\;x\;and\;y\;decay\;at\;same\;rate\qquad(c)\;y\;will\;decay\;at\;a\;faster\;rate\;than\;n\qquad(d)\;x\;will\;decay\;at\;faster\;rate\;than\;y$