Which statements are true regarding the V-belt drive?

Question

Consider the following statements regarding V-belt drive:

1. The groove angle of the sleeve is less than the belt section angle
2. The efficiency of a V-belt drive is higher than that of a flat belt drive
3. The groove angle is so made that the belt wedged in the groove

Which of the above statements are correct?

1. 1,2 and 3
2. 1 and 2 only
3. 1 and 3 only
4. 2 and 3only