Consider the following statements about the word “can” in th...

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Creating Knowledge Base Videos

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(Available at: https://www.helpscout.com/blog/video-knowledge-base/ – text especially adapted for this test). 
Consider the following statements about the word “can” in the sentence “Video can explain steps more naturally” (l. 13) in the context presented in the article: 
I. Its past form is “could”. II. It could be replaced by “must” with no significative changes in meaning. III. It expresses permission.
Which statements are correct?
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