Find the Unit Tangent Vector T and the Principal Unit $\pi$

Multiple Choice

Find the unit tangent vector T and the principal unit normal vector N.
-r(t) = (ln(cos t) + 9) i + 9j + ( 10 + t ) k, - $\pi$ /2 < t < $\pi$ /2

A) T = (sin t) i - (cos t) k; N = (cos t) i - (sin t) k;
B) T = (sin t) i + (cos t) k; N = (cos t) i - (sin t) k
C) T = (-sin t) i + (cos t) k; N = (-cos t) i + (sin t) k
D) T = (-sin t) i + (cos t) k; N = (-cos t) i - (sin t) k