Select all reason(s) that explain why f(x) = 1/(x+3) discontinuous at x = -3.
a. f(-3) is undefined.
b. lim ₓ→₋₃₋ f(x) and lim ₓ→₋₃₊ f(x) both exist but are not equal.
c. f(−3) and lim ₓ→₋₃ both exist but are not equal.
d. lim ₓ→₋₃ does not exist.
e. none of the above
