20 POINTS HELP NOW PLEASE! SERIOUS AND NO SILLY ANSWERS! :) Which is the equation of a hyperbola with directrices at x = ±3 and foci at (4, 0) and (−4, 0)?
a.) x squared over 16 minus y squared over 4 equals 1
b.) x squared over 12 minus y squared over 4 equals 1
c.) y squared over 16 minus x squared over 4 equals 1
d.) y squared over 12 minus x squared over 4 equals 1