Let `vec(C)=vec(A) +vec(B)` :
A. `|vec(C)| ` is always greater than `|vec(A)|`
B. It is possible to have `|vec(C)| lt |vec(A)|` and `|vec(C)| lt |vec(B)|`
C. `|vec(C)| ` is always equal to `|vec(A)| +|vec(B)|`
D. `|vec(C)|` is never equal to `|vec(A)|+|vec(B)|`