I think OCR is correct option. It can be done using combination of first 3 options. But OCR is more correct I guess.
Ref:
Hope this helps
These questions are so terrible. It entirely depends if the PDF is a scanned image or actual text. Depending on which it is, A or C could be correct. “Digital PDF” doesn’t tell us which it is.
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I think Option B would be correct answer. Since in the question it is mentioned that all the invoices are of same structure.
Hope it helps
Regards
Option 2 is correct