1. let s = {1,2} cr. consider the function f: r r, given by flr) = inf{lr - ul: yes. then (a) f is not contiuous. (b) f is continuous but not differentiable onl

1. Let S = {1,2} CR. Consider the function f: R R, given by flr) = inf{lr - ul: yES. Then (A) f is not contiuous. (B) f is continuous but not differentiable only at 1. (C) f is contiuous but not differentiable only at 1 and 2. (D) fis continuous but not differentiable only at 1, 3/2 and 2.