The answer
a. The Liturgy of St. Basil the Great. The Coptic Liturgy differs from the Byzantine
Liturgy of the same name. This Liturgy is the one that is most often used.
b. The Liturgy of St. Gregory the Theologian. Often used on special occasions and
feasts. Prayers of this Liturgy address the hypostasis of the Son. It is not unique in doing so because there are other liturgies with the same style, such as other Egyptian liturgies, three Ethiopian liturgies, the Syrian Liturgy of Saints Addai and Mari, and the Syrian Liturgy of St. Jacob.
c. The Liturgy of St. Cyril (St. Mark the Evangelist). St. Cyril of Alexandria
compiled it and edited the older Liturgy of St. Mark; so it came to be named after him. Its use is less widespread than the previous two.
Fr. Tadros Yacoub Malaty