Which of the following is the complete factorization of 81x3+192y3?
3(3x+4y)(9x2+12xy+16y2)
(3x+4y)(9x2−12xy+16y2)
3(3x−4y)(9x2+12xy+16y2)
3(3x+4y)(9x2−12xy+16y2)