Which of the following statements are true ?
I. All radioactive elements decay exponentially with time
II. Half-life of radioactive element is the time required for one half of the radioactive atoms to disintegrate
III. Age of the earth can be determined by radioactive dating
IV. Half. life time of a radioactive element is fifty percent of its average life period
Sleet the correct answer using the codes given below

Options

A. I and II
B. I, III and IV
C. I, II and III
D. II, and III

Answer

C