Neither. A priest celebrates a mass.
Anyone may serve at Mass IF the priest celebrating the Mass allows, it would be up to the individual priest who was the celebrant.
No, only a priest can say Mass. An Extraordinary Minister of the Eucharist could, with pastoral permission, hold a Communion Service and distribute hosts that were previously consecrated by a priest.
In the Catholic church, a celebrant is one who celebrates a sacrament. In a wedding, this would be the priest because he is the one authorized to perform the marriage.
The most important role of the priest is to perform mass. Without a priest, we could have no communion. A deacon can do almost everything else a priest can do, but only a priest (or higher) may perform transubstantiation (the miracle of turning bread into the body of Christ).
A bishop is first of all a priest and can say mass as any priest can.
The celebrant of mass must be an ordained Catholic priest. This includes monsignors, bishops, archbishops and popes.
A priest (Refereing to a Catholic) does mass as transfiguration / communion as transubstation and a vicar does a service in rememberance only. If i was you, i would go for option one , it is a true mass.
Altar servers.
Often it is the altar server or the priest
Often, a bishop or another clergyman with higher rank performs the Confirmation, but by delegation (If they are authorized to take over the confirmation for the bishop because he is busy with something else), an abbot or priest can also perform the Confirmation Mass.
Roman Catholic AnswerThe altar (and the priest when he is at the altar) are contained in the sanctuary of the Church.
The traditional robe worn by a priest when not offering Mass or administering the sacraments is the cassock. The clothing he wears during Mass are called vestments.