New Reconstruction of the Text of 2 Corinthians in Pelagius' Commentary on the Pauline Epistles

What sort of Latin biblical text did Pelagius have when he wrote his commentary on the Pauline Epistles? Did he use an Old Latin text, a Vulgate text, or some combination of the two? Of the manuscripts that pass down Pelagius's commentary, some have a strong Vulgate character while others are closer to the Old Latin.