Find the absolute extrema of the function h(t)=(t/(t-3)) on the closed interval [4,6].
a) Minimum at (4, -4), maximum at (6, 6)
b) Minimum at (4, -2), maximum at (6, 6)
c) Minimum at (4, -4), maximum at (6, 3)
d) Minimum at (4, -2), maximum at (6, 3)