The underlined portion is shown in brackets. A gallery report explains how a traveling exhibit was assembled. The writer wants to clarify that the board's belief concerned the curator's work, not the board's own actions. The draft currently includes this bracketed sentence: [The report describes the curator, whom the board believed had designed the display.] The next sentence lists the documents that support the attribution. Which revision follows standard English usage in the passage's discussion of the curator believed to have designed the display?