All options are correct.
Referencing sources is essential for several reasons:
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To indicate which ideas or information you have borrowed: It helps to distinguish between your own thoughts and those of others, giving credit to the original authors.
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To give context and evidence to your arguments: References provide support for your claims, adding credibility and context to your work.
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So that your instructor can locate all of your sources: It allows others, including your instructor, to verify your research and explore the topic further if they choose to.
Overall, proper referencing upholds academic integrity and contributes to the scholarly conversation.