I1- If () has a jump-discontinuity at = , then A) () is undefined at = B) lim x→a௔ () does not exist C) () is non-differentiable at = D) All of the above E) B and C only 2. If () has a removable discontinuity at = , then A) () is undefined at = B) lim x→a௔ () does not exist C) () is non-differentiable at = D) A and C only E) All of the above

3. If () has a cusp at = , then A) () is undefined at = B) lim x→a௔ () does not exist C) () is non-differentiable at = D) All of the above E) B and C only