Explain why the function is discontinuous at the given number a

Question

f(x) =	x + 5	if x ≤ −1
2x	if x > −1
a = −1

f(−1) is undefined.

lim x→−1  f(x) does not exist.

f(−1) and lim x→−1 f(x) are finite, but are not equal.

lim x→−1⁺  f(x) and lim x→−1⁻  f(x) are finite, but are not equal.

none of the above

Answer 1

Deteremine the limits form both the right and the left.