Catechism of the Catholic Church
All of the above. Para. 2787: When we say "our" Father, we recognize first that all his promises of love announced by the prophets are fulfilled in the new and eternal covenant in his Christ: we have become "his" people and he is henceforth "our" God. . . .
Para. 2789: When we pray to "our" Father, we personally address the Father of our Lord Jesus Christ. By doing so we do not divide the Godhead, since the Father is the "source and origin," but rather confess that the Son is eternally begotten by him and the Holy Spirit proceeds from him. . . .
Para. 2790: . . . The Church is this new communion of God and men. United with the only Son, who has become "the firstborn among many brethren," she is in communion with one and the same Father in one and the same Holy Spirit (Rom 8:29; cf. Eph 4:4-6). In praying "our" Father, each of the baptized is praying in this communion: "The company of those who believed were of one heart and soul" (Acts 4:32).
Para. 2791: . . . In communion by faith in Christ and by Baptism, they ought to join in Jesus' prayer for the unity of his disciples (Cf. UR 8; 22).
Para. 2793: The baptized cannot pray to "our" Father without bringing before him all those for whom he gave his beloved Son. God's love has no bounds, neither should our prayer (Cf. NA 5). . . .