If \(x + y = a\), \(y + z = b\) and \(x + z = c\), what is the average (arithmetic mean) of \(x\), \(y\), and \(z\)?
(A)\(\frac { a + b + c } { 2 } \) (B)\(\frac { a + b + c } { 3 } \) (C)\(\frac { a + b + c } { 4 } \) (D)\(\frac { a + b + c } { 6 } \) (E)\(\frac { a + b + c } { 12 } \)
D