Let $a , b , c$ and $d$ be four non-negative real numbers where $a + b + c + d = 1$. The number of different ways one can choose these numbers such that $a ^ { 2 } + b ^ { 2 } + c ^ { 2 } + d ^ { 2 } = \max \{ a , b , c , d \}$ is\\
(A) 1 .\\
(B) 5 .\\
(C) 11 .\\
(D) 15 .