A function f is defined on interval (0, 1) as follows when x is irrational 0, T when x is rational no.and lcm(p.q)=1 then which one of the following is true? (A

A function f is defined on interval (0, 1) as follows when x is irrational 0, T when x is rational no.and lcm(p.q)=1 then which one of the following is true? (A) fis continuous at each irrational point and discontinuous at each rational point B) (C) (D) f is continuous at each rational and irrational points f is continuous at each ratuonai point ana discontinuous at each irational point fis discontinuous at each rational and irrational points