What is the equation for the circle, if it has diameter endpoints at (3,-4) and (-5.-4)? a (x - 1)² + (y-4)² = 16 b (x + 1)² + (y-4)² = = 16 c (x + 1)² + (y + 4)² = 16 d (x − 1)² + (y+4)² = 16