Which of the following statements are not correct? <br> 1. If the speed-time graph is a straight line parallel to time axis, then it indicates that the object is moving with uniform speed <br> 2. The area below the velocity-time graph gives the distance covered by the object.<br> 3. Acceleration is taken as positive if it is in the direction opposite to the direction of velocity.<br> 4. The velocity-time graph for non-uniformly accelerated motion is always a straight line.

Question

$\begin{array}{1 1} (a)\;\text{1 and 2} \\ (b)\; \text{1 and 4} \\ (c)\; \text{2 and 4} \\ (d)\; \text{3 and 4} \end{array}$