Read the two-paragraph draft and answer the editing question. Paragraph 1: An accountant reviewed a vendor invoice that had been issued twice. The duplicate charge became visible only after a corrected copy arrived. Paragraph 2: The audit note emphasizes the point at which the error was discovered. [Not until the corrected invoice arrived, the accountant didn't notice the duplicate charge.] The extra payment was canceled before processing. In the passage about a corrected vendor invoice, which choice should replace the bracketed sentence?