If a2 + b2 + c2 = 250 and ab + bc + ca = 3, then a + b + c is Select the correct option:
A) 4	B) 8	C) 16	D) 32	E) 64

Rationale: "by formula , ( a + b + c ) ^ 2 = a ^ 2 + b ^ 2 + c ^ 2 + 2 ( ab + bc + ca ) , since , a ^ 2 + b ^ 2 + c ^ 2 = 250 and ab + bc + ca = 3 , ( a + b + c ) ^ 2 = 250 + 2 ( 3 ) = 256 = 16 ^ 2 therefore : a + b + c = 16 answer : c"
Answer: C