Which of the Following Abuses by an Undertaking in a Dominant

Which of the following abuses by an undertaking in a dominant position on the relevant market will be regarded as an exclusionary abuse under Article 102 TFEU?

A) Charging its customers excessively high prices
B) Charging different customers different prices for the same product without any objective justification such as differences in transport costs, taxation, customs duties, etc.
C) Charging its customers prices which are below the cost of production of the relevant product