How would you define pegging in the context of Advanced Planning?

An evaluation that is ordered according to the network structure of all related products and represents the coverage of issue elements

An evaluation that is ordered according to the bill-of-material structure of all related products and represents the relationship between the receipt and the issue elements

An evaluation to verify if there are overstock situations in the balance between receipt and issue elements after the production planning run

An evaluation to verify if there are material or capacity shortages in the network after the production planning run.