Which of the following is a parametrization of the line through P = (4, 9, 8) perpendicular to the xz-plane (Figure 19)?

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(a) r(t) = (4,9, 8) +1(1,0, 1) (c) r(t)=(4,9, 8) + t (0, 1, 0) (b) r(t)= (4,9, 8) + t (0,0,1) (d) r(t)=(4,9, 8) +1(1, 1,0)