Q. 18 Consider the function ifa E (R\Q)U{0}, -ifr = ne Z\{0}. p ENand gcd(n, p) = 1. Then (A) all z EQ\ {0} are strict local minima for f. (B) f is continuous at all r E Q. (C) f is not continuous at all a E R|Q (D) f is not continuous at r = 0. Science Bangalore