Negative of a Vector

Q. Refer to the following figure and find the option(s) with correct descriptions about the vectors given in the figure.

1. $\underset{a}{\to }$ = $\underset{-b}{\to }$
2. $\underset{a}{\to }$ = $\underset{-c}{\to }$
3. $\underset{c}{\to }$ = $\underset{-d}{\to }$
4. $\underset{b}{\to }$ = $\underset{-d}{\to }$

Q.

A car has a velocity $\overrightarrow{v}=80km/hr$ towards east. Another car on the road has a velocity = $\overrightarrow{-v}$. The magnitude and direction of velocity of second car is

1. 80 km/hr towards south
2. 80 km/hr towards west
3. Direction cannot be determined from the given information
4. Speed of the second car cannot be determined from the given information.