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Which JavaScript function should you use?

You develop a webpage that allows a user to download a 3PEG image and convert it to a PNG file.
You need to implement the code to download the contents of the JPEG image with no additional decoding.
Which JavaScript function should you use?

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A.
readAsBinaryString()

B.
readAsArrayBuffer()

C.
readAsDataURL()

D.
readAsText()

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