The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially, both of them have the same number of atoms. Then,
(a) x and y have the same decay rate initially
(b) x and y decay at the same rate always
(c) y will decay at a faster rate than x
(d) x will decay at a faster rate than y
A. `X` and `Y` have the same decay rate initially
B. `X` and `Y` decay at the same rate always
C. `Y` will decay at a faster rate than `X`
D. `X` will decay at a faster rate then `Y`.