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Question

Complete the Python function to find the starting index of the first occurrence of sub in main_string. Return -1 if not found. def find_substring_index(main_string, sub): _________ # Line to complete

A return main_string.find(sub)

B return main_string.index(sub)

C return main_string.search(sub)

D return main_string.locate(sub)

E return main_string.contains(sub)

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