Express the vector 8i + j + 4k as a product of its length and direction. 8i + j + 4k = (Simplify your answers. Use integers or fractions for any numbers in the expression.)Express the vector as a product of its length and direction. K /21 121 121 Choose the correct answer below. O A. K 3 O B. 1 k 3 3 O C. 1 1 i - 1+ k 713 OD. (i- j+ k) 121Find the vectors whose lengths and directions are given. Length Direction a. 9 k b. 15 - k 4 C. N S + -k 5 2 d. 7 + k