If a2 + b2 + c2 = ab + bc + ca, where a, b, c are non zero real numbers, then the value of a + b is c

If a2 + b2 + c2 = ab + bc + ca, where a, b, c are non zero real number

1.	If a2 + b2 + c2 = ab + bc + ca, where a, b, c are non zero real numbers, then the value of a + b is c
A.	2
B.	1
C.	0
D.	1
Answer» B. 1