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Othello tells Iago that he must have "ocular proof" that Desdemona is cheating on him. What is ocular proof?
Desdemona must confess it to him.
Othello must see something which proves the affair.
Desdemona must confess to Emilia.
Cassio must confess to Othello.
Othello must hear Cassio and Desdemona planning to meet.