The equation of a circle whose center is (3, -1) and which intercepts a chord of 6 units length on the straight line 2x - 5y + 18 = 0 is:
a) ( (x - 3)² + (y + 1)² = 9 )
b) ( (x + 3)² + (y - 1)² = 9 )
c) ( (x - 3)² + (y + 1)² = 36 )
d) ( (x + 3)² + (y - 1)² = 36 )
