Which of the following statements are correct regarding dot product of vectors ?

1. Dot product is less than or equal to the product of magnitudes of two vectors.

2. When two vectors are perpendicular to each other, then their dot product is non -zero.

3. Dot product of two vectors is positive or negative depending whether the angle between the vectors is less than or greater than π/2

4. Dot product is equal to the product of one vector and the projection of the vector on the first one. Select the correct answer using the codes given below :

(a) 1, 2 and 3 only (b) 1, 3 and 4 only (c) 1, 2 and 4 only (d) 2, 3 and 4 only

1. Dot product is less than or equal to the product of magnitudes of two vectors.

2. When two vectors are perpendicular to each other, then their dot product is non -zero.

3. Dot product of two vectors is positive or negative depending whether the angle between the vectors is less than or greater than π/2

4. Dot product is equal to the product of one vector and the projection of the vector on the first one. Select the correct answer using the codes given below :

(a) 1, 2 and 3 only (b) 1, 3 and 4 only (c) 1, 2 and 4 only (d) 2, 3 and 4 only