Find the equations of circles which pass through two points on the x-axis at distances of 4 units from the origin and whose radius is 5 units.
a) ( (x - 5)² + y² = 25 ) and ( (x + 5)² + y² = 25 )
b) ( (x + 4)² + y² = 25 ) and ( (x - 4)² + y² = 25 )
c) ( (x - 4)² + y² = 25 ) and ( (x + 4)² + y² = 25 )
d) ( (x + 5)² + y² = 25 ) and ( (x - 5)² + y² = 25 )