Which one of the following is the right definition of 'peer review'?
1
A post-publication process in which the work is submitted to a panel of reviewers for ascertaining quality
2
A pre-publication process in which work submitted for publication is evaluated for quality by experts in the field
3
A pre-publication process in which work submitted for publication is accompanied by recommendation of other experts in the field
4
A post-publication process in which the work is submitted for a professional review