Given vector [tex]\displaystyle{\vec u\neq \vec 0, \vec v\neq \vec 0}[/tex] and [tex]\displaystyle{|\vec u| \neq |\vec v|}[/tex] Consider the following statements
A.) Measurement between [tex]\displaystyle{3\vec u}[/tex] and [tex]\displaystyle{3\vec v}[/tex] is 3 times of measurement between [tex]\displaystyle{\vec u}[/tex] and [tex]\displaystyle{\vec v}[/tex]
B.) Measurement between [tex]\displaystyle{\vec u - \vec v}[/tex] and [tex]\displaystyle{\vec v - \vec u}[/tex] is 180°
C.) Measurement between [tex]\displaystyle{\vec u + \vec v}[/tex] and [tex]\displaystyle{\vec u - \vec v}[/tex] is 90°

Which statements are correct?
1. A is only correct
2. B is only correct
3. C is only correct
4. A and B are only correct
5. B and C are only correct