Correct statement(s) is/are:
A. Radioactive decay follows first order kinetics.
B. If concentration of the reactant is doubled, half life remain constant in the zero order reaction.
C. For a zero order reaction, t_1/2 is directly proportional to the initial concentration of the reactants and inversely proportional to the rate constant.
D. For first order reaction, t_1/2 is independent of initial concentration of the reacting species.