Which of the following is not always true?

Options

A. `|veca+vecb|^(2)=|veca|^(2)+|vecb|^(2)` is `veca` and `vecb` are perpendicular to each other
B. `|veca+lamdavecb|ge|veca|` for all `lamdainR` if `veca` and `vecb` are perpendicular to each other
C. `|veca+vecb|^(2)+|veca-vecb|^(2)=2(|veca|^(2)+|vecb|^(2))`
D. `|veca+lamdavecb|ge|veca|` for all `lamdainR` if `veca` is parallel to `vecb`