Choose the correct statement.

Options

A. If `vec(A) + vec(B) = vec(A) - vec(B)` then `vec(B)`is a null vector
B. If `|vec(A) + vec(B)| = |vec(A) - vec(B)|`, then `vec(A)` and `vec(B)` are perpendicular vectors
C. both of the above
D. none of the above

Answer

C