Let a, b, c, d, e, f, g and h be distinct elements in the set { −7, −5, −3, −1, 1, 4, 6, 15} . what is the minimum possible value of (a + b + c + d)2+ (e + f + g + h)2?
(a) 30
(b) 32
(c) 42
(d) 50
(e) 52