Find the points on the curve ( x=t²-4t-7, , y=t²+16t+3 ) that have: A. a horizontal tangent line; B. a vertical tangent line:
a) A. ( (-2, -3) ); B. ( (-2, -3) )
b) A. ( (2, 3) ); B. ( (2, 3) )
c) A. ( (2, 3) ); B. ( (-2, -3) )
d) A. ( (-2, -3) ); B. ( (2, 3) )