What are the differences between cluslering and classification?

In classification, we don't have any prior information about the groups, or any labelled dala, unlike dustering.

In classification, we have prior information about the groups or prior labelled data, unlike clustering.

Clustering is an unsupervised learning problem, whereas classification is a supervised learning problem

Clustering is a supervised learning problem, whereas classification is an unsupervised learning problem.

$1$ and $2$

$2$ and $3$

$1$ and $3$

All of the above