DEPRECATED: Recognizing vector quantities

You might need: Calculator

Problem

Below is a drawing of vectors a, with, vector, on top and b, with, vector, on top.
Which of the following quantities is the same as the vector a, with, vector, on top? Which is equal to its magnitude vertical bar, vertical bar, a, with, vector, on top, vertical bar, vertical bar? Which is neither?
space
 
The same as a, with, vector, on top
Equal to vertical bar, vertical bar, a, with, vector, on top, vertical bar, vertical bar
Neither
b, with, vector, on top
A vector identical to b, with, vector, on top but in the opposite direction
A vector twice as long as b, with, vector, on top
4, square root of, 2, end square root