If `theta` is the angle between two vectors ` veca` and `vecb`, then ` veca* vecb ge 0` ``only when
`(A)0 lt theta lt pi/2`
`(B) 0lt=theta lt=pi/2`
`(C)0 lt theta lt pi`
`(D)0 lt=theta lt=pi`

Explanation

To solve the problem, we need to analyze the condition given for the dot product of two vectors \( \vec{a} \) and \( \vec{b} \).

### Step-by-Step Solution:

1. **Understanding the Dot Product**:
The dot product of two vectors \( \vec{a} \) and \( \vec{b} \) is given by the formula:
\[
\vec{a} \cdot \vec{b} = |\vec{a}| |\vec{b}| \cos \theta
...