If `veca,vecb,vecc` are three non-zero vectors such that each one of these is perpendicular to the sum of the other two vectors, then the value of `|veca+vecb+vecc|^2` is :

Options

A. 1) `|veca|^2+|vecb|^2+|vecc|^2`
B. 2) `|veca|+|vecb|+|vecc|`
C. 3) `2(|veca|^2+|vecb|^2+|vecc|^2)`
D. 4) `1/2(|veca|^2+|vecb|^2+|vecc|^2)`