Without using technology, describe the end behavior of f(x) = −3x38 + 7x3 − 12x + 13

Without using technology, describe the end behavior of f(x) = −3x38 + 7x3 − 12x + 13.

a. Down on the left, down on the right
b. Down on the left, up on the right
c. Up on the left, down on the right
d. Up on the left, up on the right