Replace the phrase in bold in the following sentence to make the sentence grammatically correct. If the sentence is correct, mark 'No correction required' as the answer. (Ignore the errors of punctuations, if any).
The University cancelled the exam within ten minutes of its beginning after it was discovered that the question paper was been leaked.
had been leaked
As the sentence has the 3rd form of verb ‘been’, it should be preceeded by ‘had’ as ‘question paper had been leaked’ instead of ‘question paper was been leaked’