IPC Abetment and Common Intention Conundrum

I'm taking a course with my friend Anuj and we're stuck on IPC 34(2). The question is: Is common intention a pre-requisite for abetment under this section? One of us is wrong, we need your brains to settle this.

Anuj says that yes, you need to establish a common intention between A and B for A to be guilty of abetment under IPC 34(2). According to him, the mere proximity of A and B to the crime doesn't suffice. They need to share a common goal, a unified intention.

On the other hand, I'm saying that common intention is not a must, but rather a circumstantial aspect. The key here is the degree of encouragement and support given by A to B, which may lead to B's committing the crime or its continuation.