Two vertices of a triangle have position vectors 3i + 4j - 4k and 2i + 3j + 4k. If the position vector of the centroid is i + 2j + 3k, then the position vector of the third vertex is …
(a) -2i - j + 9k
(b) -2i - j - 6k
(c) 2i - j + 6k
(d) -2i + j + 6k