"No Ray, It Was You"

Watched Field of Dreams with TheWife over the weekend, and had a discussion about a part of the last scene. After Ray realizes that the catcher is his father, he turns to Shoeless Joe and says "It was you." To which Shoeless Joe replies, "No Ray, it was you."

To what does the "it" refer? We had three distinct possibilities we were trying to sort through.

(1) It was you who brought the father back.
(2) It was your pain that was to be eased.
(3) The voice is yours.

Is it one of these three interpretations? If do, which one? If not, what were they talking about?