If the magnitude of vector vec() is A and the magnitude of vector vec() is , the magnitude of the vector sum vec() + vec() is

A. 0 ≤ |c() + vec()| ≤ +
B. - ≤ |c() + vec()| ≤
C. 0 ≤ |c() + vec()| ≤
D. ≤ |c() + vec()| ≤ +