Direction: Which of the phrases given below the sentence should replace the word/phrase given below in bold in the sentence to make it grammatically correct? If the sentence is correct as it is given and no correction is required, mark 'no correction required' as the answer.
Dr. Fauci, who is the head of the U.S. National Institute of Allergy and Infectious Diseases, said that India and the U.S. must have continue in collaborating on research related to SARS-CoV-2 as well as vaccines and adjutants.
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must have continue to collaborate
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must continue in collaborating
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must have continued in collaborating
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must continue to collaborate
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No correction required